Feedwater pump recirculation control methods, devices, media and electronic equipment

Abstract

The present disclosure relates to the field of automatic control, and in particular, to a method, device, medium and electronic device for controlling the recirculation of a water supply pump. The method comprises: obtaining the actual flow of the water supply pump; determining a first valve adjustment instruction according to the actual flow of the water supply pump, a first flow threshold value and a second flow threshold value of the water supply pump, wherein the first valve adjustment instruction comprises a valve adjustment opening increase instruction and a valve adjustment opening decrease instruction, the valve adjustment opening increase instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is increased at a first rate within a first time period, and the valve adjustment opening decrease instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is decreased at a second rate within a second time period; according to the first valve adjustment instruction, the recirculation door action of the water supply pump is controlled. In this way, the automatic control of the recirculation door of the water supply pump can be realized, the recirculation door action of the water supply pump can be controlled quickly and accurately, and the changes in load and flow can be adapted by automatically adjusting the valve opening of the recirculation door.

Description

Technical Field

[0001] The present disclosure relates to the field of automatic control, and in particular to a feedwater pump recirculation control method, device, medium and electronic equipment. Background Art

[0002] In the supercritical intermediate reheat 600MW steam turbine generator set, two 13.5MW variable speed condensing steam turbines are usually used to drive the feedwater pumps in parallel operation, that is, each steam-driven feedwater pump supplies half the boiler's feedwater capacity. When the unit is running, as the load of the main engine changes, the evaporation of the boiler changes accordingly, and the feedwater flow rate will also change. The change in feedwater flow rate is achieved by changing the speed of the steam-driven feedwater pump. In order to change the speed to meet the needs of steam pump operation, the steam pump regulation system receives the regulation signal of the boiler feedwater regulation system and automatically adjusts the amount of steam entering the steam turbine to change the speed and output power of the steam turbine, thereby meeting the boiler feedwater requirements of the unit under various loads.

[0003] During the low-load stage of the unit, the feedwater flow provided by the two parallel feedwater pumps needs to be reduced to match the boiler evaporation needs. In order to prevent cavitation, the feedwater flow needs to be kept above a limit, which requires the feedwater pump recirculation gate to participate in the adjustment to ensure that the feedwater flow is controlled within a certain safety range. The control of the recirculation gate of traditional thermal power units is mostly manual. During the low-load lifting and lowering stage of the unit, manual intervention makes it difficult to quickly and accurately control the valve action. Summary of the invention

[0004] The purpose of the present disclosure is to provide a water supply pump recirculation control method, device, medium and electronic equipment to avoid errors caused by manual operation, quickly and accurately control the recirculation door action of the water supply pump, and adapt to changes in load and flow by automatically adjusting the recirculation door opening.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a first aspect of a feedwater pump recirculation control method, the method comprising:

[0006] Get the actual flow of the water supply pump;

[0007] Determine a first valve adjustment instruction according to the actual flow rate of the water supply pump, the first flow rate threshold value and the second flow rate threshold value of the water supply pump, wherein the first valve adjustment instruction includes a valve adjustment opening increase instruction and a valve adjustment opening decrease instruction, the valve adjustment opening increase instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is controlled to increase at a first rate within a first time period, and the valve adjustment opening decrease instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is controlled to decrease at a second rate within a second time period;

[0008] According to the first valve adjustment instruction, the recirculation valve action of the water supply pump is controlled.

[0009] A second aspect of the present disclosure provides a feedwater pump recirculation control device, comprising:

[0010] An acquisition module is used to obtain the actual flow of the water supply pump;

[0011] a first determining module, configured to determine a first valve adjustment instruction according to an actual flow rate of the water supply pump, a first flow rate threshold value of the water supply pump, and a second flow rate threshold value, wherein the first valve adjustment instruction includes a valve adjustment opening increase instruction and a valve adjustment opening decrease instruction, the valve adjustment opening increase instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is increased at a first rate within a first time period, and the valve adjustment opening decrease instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is decreased at a second rate within a second time period;

[0012] The first control module is used to control the recirculation valve action of the water supply pump according to the first valve adjustment instruction.

[0013] A third aspect of the present disclosure provides a non-temporary computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method provided in the first aspect of the present disclosure.

[0014] A fourth aspect of the present disclosure provides an electronic device, including:

[0015] a memory having a computer program stored thereon;

[0016] A controller, wherein when the computer program is executed by the controller, the steps of the method provided in the first aspect of the present disclosure are implemented.

[0017] In the above technical scheme, the first valve adjustment instruction is determined according to the actual flow rate of the water supply pump, the first flow rate threshold value and the second flow rate threshold value of the water supply pump, wherein the first valve adjustment instruction includes a valve opening increase instruction and a valve opening decrease instruction, the valve opening increase instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is increased at a first rate within a first time period, and the valve opening decrease instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is decreased at a second rate within a second time period; and according to the first valve adjustment instruction, the recirculation door action of the water supply pump is controlled. In this way, the automatic control of the recirculation door of the water supply pump can be realized, the recirculation door action of the water supply pump can be controlled quickly and accurately, and the changes in load and flow can be adapted by automatically adjusting the valve opening of the recirculation door.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 is a flow chart of a feedwater pump recirculation control method provided by an exemplary embodiment of the present disclosure.

[0021] Figure 2 is a block diagram of a feedwater pump recirculation control device provided by an exemplary embodiment of the present disclosure.

[0022] Figure 3 is a block diagram of an electronic device provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0025] Figure 1 : is a flow chart of a feedwater pump recirculation control method provided by an exemplary embodiment of the present disclosure. The method can be applied to the control system of the unit where the feedwater pump is located, for example, it can be a DCS (Distributed Control System) system of the unit where the feedwater pump is located. Figure 1 As shown, the method may include S101 to S103.

[0026] S101, obtaining the actual flow rate of the water supply pump.

[0027] For example, the actual flow of the water feed pump can be obtained by using a flow sensor pre-installed on the outlet pipe of the water feed pump to provide data support for controlling the action of the recirculation door.

[0028] S102, determining a first valve adjustment instruction according to the actual flow rate of the water supply pump, a first flow rate threshold value and a second flow rate threshold value of the water supply pump.

[0029] Among them, the first valve adjustment instruction includes a valve adjustment opening increase instruction and a valve adjustment opening decrease instruction. The valve adjustment opening increase instruction is used to indicate that the valve opening of the recirculation valve of the water supply pump is controlled to increase at a first rate within a first time period, and the valve adjustment opening decrease instruction is used to indicate that the valve opening of the recirculation valve of the water supply pump is controlled to decrease at a second rate within a second time period.

[0030] Exemplarily, the first flow threshold and the second flow threshold can be pre-set by the staff, so as to automatically adjust the valve opening of the recirculation door by comparing the actual flow of the water supply pump, the first flow threshold and the second flow threshold of the water supply pump, and adapt to the changes in load and flow. The first duration and the second duration can be pre-controlled, for example, both can be set to 10 minutes. The first rate and the second rate can be pre-set, or they can be determined autonomously by the control system. Taking the valve opening increase instruction as an example, the first duration is 10 minutes, and the first rate is the preset v1, then it can be determined that the valve opening increase instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is increased according to the preset v1 within 10 minutes. Alternatively, the target valve opening corresponding to the valve opening increase instruction and the target valve opening corresponding to the valve opening reduction instruction can also be set, so that the difference between the target valve opening and the current valve opening can be determined, and the ratio of the difference to the corresponding adjustment duration is determined as the corresponding rate. Still taking the valve opening increase instruction as an example, the difference between the corresponding target valve opening and the current valve opening is a, and the corresponding first time length is 10 minutes, then the value of the first rate can be determined as a / 10, and it can be determined that the valve opening increase instruction is used to indicate that the valve opening of the recirculation valve of the water feed pump is controlled to increase at a rate of a / 10 within 10 minutes.

[0031] S103, controlling the action of the recirculation valve of the water supply pump according to the first valve adjustment instruction.

[0032] Exemplarily, after the control system determines the first valve adjustment instruction, the first valve adjustment instruction can be sent to the electric (or pneumatic) actuator of the water feed pump recirculation door, and the action of the water feed pump recirculation door can be controlled by controlling the action of the actuator.

[0033] In the above technical scheme, the first valve adjustment instruction is determined according to the actual flow rate of the water supply pump, the first flow rate threshold value and the second flow rate threshold value of the water supply pump, wherein the first valve adjustment instruction includes a valve opening increase instruction and a valve opening decrease instruction, the valve opening increase instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is increased at a first rate within a first time period, and the valve opening decrease instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is decreased at a second rate within a second time period; and according to the first valve adjustment instruction, the recirculation door action of the water supply pump is controlled. In this way, the automatic control of the recirculation door of the water supply pump can be realized, the recirculation door action of the water supply pump can be controlled quickly and accurately, and the changes in load and flow can be adapted by automatically adjusting the valve opening of the recirculation door.

[0034] Optionally, in S102, determining the first valve adjustment instruction according to the actual flow rate of the water supply pump, the first flow rate threshold value and the second flow rate threshold value of the water supply pump may include:

[0035] If the actual flow rate of the water supply pump is greater than the first flow rate threshold, the first valve adjustment instruction is determined to be a valve adjustment opening reduction instruction;

[0036] If the actual flow rate of the water supply pump is less than the second flow rate threshold, the first valve adjustment instruction is determined to be a valve adjustment opening increase instruction.

[0037] For example, if the actual flow rate of the water feed pump is greater than the first flow rate threshold, it can be determined that the current actual flow rate is large, and an appropriate reduction in the flow rate will not affect the safe operation of the water feed pump. Therefore, the actual flow rate of the water feed pump can be reduced by controlling the valve opening of the recirculation door to avoid energy waste and improve economy. If the actual flow rate of the water feed pump is less than the second flow rate threshold, it can be determined that the actual flow rate has exceeded the minimum flow rate corresponding to the ideal flow rate range under the current working conditions. In order to adapt to the current working conditions, the valve opening of the recirculation door can be controlled to increase, thereby increasing the actual flow rate of the water feed pump and ensuring the safe operation of the water feed pump.

[0038] As described above, the first flow threshold and the second flow threshold can be preset by a staff.

[0039] Preferably, the water supply pump recirculation control method provided by the present disclosure may further include:

[0040] Determining a first flow threshold value according to a first flow base and a first deviation allowance;

[0041] A second flow threshold is determined according to the second flow base and the second deviation allowance.

[0042] Exemplarily, the first flow base and the second flow base can be preset when the equipment leaves the factory, or can be preset by the staff. The first flow base and the second flow base are reference values, which can adapt to most working conditions. Therefore, the first flow base can be directly set to the first flow threshold, and the second flow base can be set to the second flow threshold. For example, the first flow base can be set to 600t / h, and the second flow base can be set to 300t / h.

[0043] However, during the actual operation of the water supply pump, it may be disturbed by various factors, resulting in the current working condition being a special working condition that is difficult to adapt to the first flow base and the second flow base. The flexibility of setting the first flow threshold and the second flow threshold can be improved by setting the first deviation allowance and the second deviation allowance. Among them, the value range of the first deviation allowance and the second deviation allowance can be 0 to 50t / h. In order to enhance human-machine collaboration, an operating interface for the inlet flow of the water supply pump can be set, which includes setting windows for the first flow base, the second flow base, the first deviation allowance and the second deviation allowance, and the staff can set the corresponding values ​​through the corresponding windows. A display window for the actual flow can also be set on the operating interface to facilitate the staff to understand the flow situation in a timely manner.

[0044] Optionally, before controlling the recirculation door of the feedwater pump to operate, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0045] If the actual flow rate of the water supply pump is less than the third flow rate threshold, the first valve adjustment instruction is locked, and a valve full-open instruction is generated to control the recirculation door action of the water supply pump, wherein the valve full-open instruction is used to indicate that the valve opening of the recirculation door is controlled to reach a maximum value within the third time period;

[0046] If the actual flow rate of the water supply pump is not less than the third flow rate threshold, the recirculation valve of the water supply pump is controlled to operate according to the first valve adjustment instruction.

[0047] Exemplarily, the third flow threshold can be preset, for example, it can be set to 270t / h. If the water supply pump is running at a very small flow rate or zero flow rate, the water in the pump body will be heated by the friction of the impeller, which will increase the water temperature. After the water temperature rises to a certain degree, vaporization will occur, forming cavitation, which will lead to damage to the water supply pump. In order to prevent the occurrence of the above phenomenon, when the actual flow rate of the water supply pump is less than the third flow threshold, the recirculation door can be controlled to be fully opened to ensure that there is enough water passing through the water pump. Among them, the third duration can be preset. If the actual flow rate of the water supply pump is less than the third flow threshold, the first valve adjustment instruction can be locked and the valve full opening instruction can be generated to clearly control the valve opening of the recirculation door to reach the maximum value, that is, to reach the fully open state. If the actual flow rate of the water supply pump is not less than the third flow threshold, the above problem does not exist, and the recirculation door action of the water supply pump can be controlled according to the first valve adjustment instruction.

[0048] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0049] If a valve opening increase instruction or a valve full opening instruction is received during the process of reducing the valve opening of the recirculation valve of the feedwater pump, the valve opening is controlled to increase;

[0050] If a valve opening reduction instruction is received during the process of increasing the valve opening of the recirculation valve of the water supply pump, the valve opening will continue to be controlled to increase.

[0051] For example, during the process of increasing the valve opening of the recirculation gate of the water feed pump, if the actual flow rate of the water feed pump increases suddenly and exceeds the first flow rate threshold, the valve opening can be reduced to avoid energy waste and improve economy. However, the purpose of setting up the recirculation of the water feed pump is mainly to protect the water feed pump, that is, to prevent the water temperature in the pump from rising and to avoid cavitation. If the actual flow rate of the water feed pump is maintained at a large flow rate for too short a time, it may result in the inability to take away the heat generated during the operation of the water feed pump, and it will be difficult to achieve the purpose of protecting the water feed pump. Therefore, if a valve opening reduction instruction is received during the process of increasing the valve opening of the recirculation gate of the water feed pump, the valve opening reduction instruction can be ignored, and the valve opening can continue to be controlled to increase, so as to achieve the purpose of giving priority to protecting the safe operation of the water feed pump.

[0052] During the process of reducing the valve opening of the recirculation gate of the water feed pump, if the actual flow of the water feed pump drops sharply and is lower than the second flow threshold, in order to prevent the water from generating heat and increasing the water temperature due to the friction of the impeller in the pump body, the valve opening can be controlled to increase according to the received valve opening increase command or the valve full opening command, so as to achieve the purpose of protecting the safe operation of the water feed pump.

[0053] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0054] According to the received valve control instruction and the current opening of the recirculation door, the opening logic value of the recirculation door is determined in real time.

[0055] The valve control instruction may include a first valve adjustment instruction, a valve full opening instruction, and a second valve adjustment instruction determined according to a preset valve opening value of the recirculation issued by the user and the current valve opening.

[0056] Exemplarily, if the valve control instruction is a throttle opening deduction instruction, the current opening of the recirculation door is b, the second rate corresponding to the throttle opening deduction instruction is v2, and the throttle duration is t, then it can be determined that at time t, the logical value of the recirculation door opening is b-v2·t. If the valve control instruction is a throttle opening increase instruction, the current opening of the recirculation door is c, the first rate corresponding to the throttle opening deduction instruction is v1, and the throttle duration is t, then it can be determined that at time t, the logical value of the recirculation door opening is c+v1·t. The corresponding rate can be determined based on the preset opening value of the recirculation issued by the user and the current opening, and then the corresponding second throttle instruction can be determined. The second throttle instruction can be used to indicate the corresponding throttle duration and throttle rate, and then the logical value of the recirculation door opening can be determined in real time.

[0057] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0058] When receiving the automatic command, if the opening logic value is consistent with the opening preset value issued by the user, the control mode of the recirculation door is the automatic mode.

[0059] For example, in order to enhance human-machine collaboration, an operation interface for the water pump inlet flow rate can be set, and two options, automatic mode and manual mode, can be set on the operation interface. In manual mode, the staff can enter the preset value of the opening, while in automatic mode, the window corresponding to the preset value of the opening cannot enter the corresponding value. And the operation interface can also display the opening logic value, as well as the opening feedback value (i.e., the current opening), so that the staff can promptly understand the relevant data of the valve opening. If the staff clicks on the automatic mode option, an automatic instruction will be generated. When it is determined that the opening logic value is consistent with the preset value of the opening issued by the user, the control mode of the recirculation door can be controlled to automatic mode. In this way, the possibility of misoperation and misoperation can be reduced, thereby protecting the correct action.

[0060] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0061] When the unit where the feed water pump is located is not in the condition of load reduction due to auxiliary machine failure, if the deviation between the opening logic value at each moment in the fourth time period and the received opening feedback value of the recirculation door is greater than the opening deviation threshold, the control mode of controlling the recirculation door is manual mode.

[0062] Among them, when the actual power of the unit is limited due to the tripping of the main auxiliary equipment of the unit (the coordinated control system is in the automatic state), in order to adapt to the output of the equipment, the coordinated control system forces the unit load to be reduced to the load target value that the auxiliary equipment that is still in operation can bear. This function of the coordinated control system is called auxiliary equipment failure load reduction (RUNBACK), referred to as RB. That is, under the working condition of RB, the automatic adjustment ability of the valve is stronger. Even if the control mode of the recirculation door is manual mode, the staff cannot make more precise adjustments than in the automatic mode. Therefore, if the unit where the feedwater pump is located is in the working condition of auxiliary equipment failure load reduction, even if the deviation between the opening logic value and the received recirculation door opening feedback value at the current moment is greater than the opening deviation threshold, the original control mode can be maintained.

[0063] Exemplarily, the opening deviation threshold can be preset, for example, it can be set to 20. The received feedback value of the opening of the recirculation door is the current opening of the recirculation door. When the unit where the water supply pump is located is not in the condition of auxiliary machine failure and load reduction, if the deviation between the opening logic value at the current moment and the received feedback value of the opening of the recirculation door is 50, that is, the deviation between the logic value and the actual current opening is too large, then it can be determined that the water supply pump has an abnormal working condition, and the control mode is determined to be manual, which can prevent the working condition regulation from deteriorating. The fourth time length can be preset, for example, it can be set to 30s, so that the valve can be manually switched due to signal fluctuations or valve switch lags.

[0064] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0065] Obtaining in real time the flow rate fed back from at least two preset points on the outlet pipeline of the water supply pump;

[0066] When the unit where the feedwater pump is located is not in the condition of load reduction due to auxiliary machine failure, if the difference in flow rates fed back from any two preset points is greater than the flow difference threshold, the control mode of controlling the recirculation door is manual mode.

[0067] Exemplarily, the flow difference threshold can be preset, and the setting range can be -100t / h to 100t / h. If the difference between the flow rates fed back from any two preset points is 200, and the flow rates collected by the collection devices at different positions on the same outlet pipe are different, that is, the deviation of the flow rates fed back from different positions in the same pipeline is too large, then it can be determined that the water supply pump is abnormal, and the control mode can be determined as manual to prevent the working condition from deteriorating. In this way, the flow rates fed back from multiple preset points can be used to determine whether the water supply pump has an abnormal working condition, and then determine whether to set the control mode to manual to prevent the working condition from deteriorating.

[0068] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0069] The average value of the flow rates fed back from at least two preset points on the outlet pipeline of the water supply pump obtained in real time is determined as the actual flow rate of the water supply pump.

[0070] In this way, the accuracy of the actual flow of the water supply pump can be improved by feeding back the flow at multiple preset points.

[0071] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0072] If the quality of the flow is judged as bad, the control mode for controlling the recirculation door is manual mode.

[0073] Exemplarily, the quality of the flow can be determined by a pre-set mass flow meter to determine whether it is a bad point (i.e., to determine whether the quality of the flow is abnormal). If it is a bad point, it can be determined that the water pump is abnormal, and the control mode can be determined to be manual to prevent the operating condition regulation from deteriorating.

[0074] Optionally, the feedwater pump recirculation control method provided by the present disclosure may further include:

[0075] If the unit where the water feed pump is located also includes other water feed pumps, the first flow thresholds corresponding to different water feed pumps are controlled to be different values, and the second flow thresholds corresponding to different water feed pumps are controlled to be different values.

[0076] For example, taking the two water supply pumps included in the unit as an example, if the two water supply pumps trigger the high and low limit actions at the same time, it may cause great disturbance and impact on the water supply flow, affecting safe and stable operation. Therefore, the first flow thresholds corresponding to the two water supply pumps can be controlled to be different values, and the corresponding second flow thresholds can be different values ​​(for example, for the first flow thresholds corresponding to the two water supply pumps, different deviation allowances can be set when the flow base is the same) to avoid the two water supply pumps working at the same time. For another example, if the initial values ​​of the first flow thresholds corresponding to the two water pumps are the same, the first flow threshold corresponding to any one of the water supply pumps can be controlled to be increased or decreased to a certain extent according to the preset adjustment threshold. For example, if the first flow thresholds corresponding to the two water supply pumps are both 300t / h, and the preset adjustment threshold is 20t / h, then the first flow threshold corresponding to the second water supply pump can be adjusted to 320t / h to avoid the two water supply pumps working at the same time.

[0077] Based on the same inventive concept, the present disclosure also provides a water supply pump recirculation control device. Figure 2 is a block diagram of a feedwater pump recirculation control device provided by an exemplary embodiment of the present disclosure. Figure 2 , the feedwater pump recirculation control device 200 may include:

[0078] An acquisition module 201 is used to acquire the actual flow rate of the water supply pump;

[0079] A first determining module 202 is used to determine a first valve adjustment instruction according to an actual flow rate of the water supply pump, a first flow rate threshold value of the water supply pump, and a second flow rate threshold value, wherein the first valve adjustment instruction includes a valve adjustment opening increase instruction and a valve adjustment opening decrease instruction, the valve adjustment opening increase instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is controlled to increase at a first rate within a first time period, and the valve adjustment opening decrease instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is controlled to decrease at a second rate within a second time period;

[0080] The first control module 203 is used to control the recirculation valve action of the water supply pump according to the first valve adjustment instruction.

[0081] In the above technical scheme, the first valve adjustment instruction is determined according to the actual flow rate of the water supply pump, the first flow rate threshold value and the second flow rate threshold value of the water supply pump, wherein the first valve adjustment instruction includes a valve opening increase instruction and a valve opening decrease instruction, the valve opening increase instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is increased at a first rate within a first time period, and the valve opening decrease instruction is used to indicate that the valve opening of the recirculation door of the water supply pump is decreased at a second rate within a second time period; and according to the first valve adjustment instruction, the recirculation door action of the water supply pump is controlled. In this way, the automatic control of the recirculation door of the water supply pump can be realized, the recirculation door action of the water supply pump can be controlled quickly and accurately, and the changes in load and flow can be adapted by automatically adjusting the valve opening of the recirculation door.

[0082] Optionally, the first determining module 202 includes:

[0083] A first determining submodule, configured to determine that the first valve adjustment instruction is the valve adjustment opening degree reduction instruction if the actual flow rate of the water supply pump is greater than the first flow rate threshold;

[0084] The second determining submodule is used to determine that the first valve adjustment instruction is the valve adjustment opening increase instruction if the actual flow rate of the water supply pump is less than the second flow rate threshold.

[0085] Optionally, the device 200 further includes:

[0086] A second determination module, configured to determine the first flow threshold value according to a first flow base and a first deviation allowance;

[0087] The third determination module is used to determine the second flow threshold according to the second flow base and the second deviation allowance.

[0088] Optionally, the first control module 203 further includes:

[0089] a first control submodule, configured to lock the first valve adjustment instruction and generate a valve full-open instruction to control the recirculation door action of the water supply pump if the actual flow rate of the water supply pump is less than a third flow rate threshold, wherein the valve full-open instruction is used to indicate that the valve opening of the recirculation door is controlled to reach a maximum value within a third time period;

[0090] The second control submodule is used to control the recirculation valve action of the water supply pump according to the first valve adjustment instruction if the actual flow of the water supply pump is not less than a third flow threshold.

[0091] Optionally, the first control module 203 is also used to control the valve opening to increase if the valve opening increase instruction or the valve full opening instruction is received during the process of decreasing the valve opening of the recirculation valve of the water supply pump; and to continue to control the valve opening to increase if the valve opening decrease instruction is received during the process of increasing the valve opening of the recirculation valve of the water supply pump.

[0092] Optionally, the device 200 further includes:

[0093] The fourth determination module is used to determine the opening logic value of the recirculation valve in real time according to the received valve control instruction and the current opening of the recirculation valve, wherein the valve control instruction includes the first valve adjustment instruction, the valve full opening instruction, and the second valve adjustment instruction determined according to the recirculation opening preset value issued by the user and the current opening.

[0094] Optionally, the device 200 further includes:

[0095] The second control module is used to control the recirculation door to manual mode when the unit where the water supply pump is located is not in the condition of load reduction due to auxiliary machine failure, and if the deviation between the opening logic value at each moment in the fourth time period and the received opening feedback value of the recirculation door is greater than the opening deviation threshold.

[0096] Optionally, the device 200 further includes:

[0097] The third control module is used to control the control mode of the recirculation door to the automatic mode when receiving the automatic command and if the opening logic value is consistent with the opening preset value issued by the user.

[0098] Optionally, the acquisition module 201 is further used to acquire in real time the flow rates fed back from at least two preset points on the outlet pipe of the water supply pump;

[0099] The device 200 further includes:

[0100] The fourth control module is used to control the recirculation door to manual mode when the unit where the water supply pump is located is not in the condition of auxiliary machine failure load reduction and if the difference in flow rate feedback from any two preset points is greater than the flow rate difference threshold.

[0101] Optionally, the acquisition module 201 is further used to determine an average value of flow rates fed back from at least two preset points on the outlet pipe of the water supply pump acquired in real time as the actual flow rate of the water supply pump.

[0102] Optionally, the device 200 further includes:

[0103] The fifth control module is used to control the control mode of the recirculation door to a manual mode if the quality of the flow is judged to be a bad point.

[0104] Optionally, the device 200 further includes:

[0105] The sixth control module is used to control the first flow thresholds corresponding to different water feed pumps to be different values, and to control the second flow thresholds corresponding to different water feed pumps to be different values ​​if the unit where the water feed pump is located also includes other water feed pumps.

[0106] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0107] Figure 3 FIG. 7 is a block diagram of an electronic device 700 according to an exemplary embodiment. Figure 3 As shown, the electronic device 700 may include: a processor 701 and a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705.

[0108] The processor 701 is used to control the overall operation of the electronic device 700 to complete all or part of the steps in the above-mentioned feedwater pump recirculation control method. The memory 702 is used to store various types of data to support the operation of the electronic device 700, and these data may include, for example, instructions for any application or method used to operate on the electronic device 700, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 703 may include a screen and an audio component. The screen may be, for example, a touch screen, 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 signal may be further stored in the memory 702 or sent through the communication component 705. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, and the other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 705 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0109] In an exemplary embodiment, the electronic device 700 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned water pump recirculation control method.

[0110] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned feedwater pump recirculation control method are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 702 including program instructions, and the above-mentioned program instructions can be executed by the processor 701 of the electronic device 700 to complete the above-mentioned feedwater pump recirculation control method.

[0111] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above feedwater pump recirculation control method when executed by the programmable device.

[0112] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0113] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0114] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A water supply pump recirculation control method, characterized in that: The method comprises: Get the actual flow of the water supply pump; Determine a first valve adjustment instruction according to the actual flow rate of the water supply pump, the first flow rate threshold value and the second flow rate threshold value of the water supply pump, wherein the first valve adjustment instruction includes a valve adjustment opening increase instruction and a valve adjustment opening decrease instruction, the valve adjustment opening increase instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is controlled to increase at a first rate within a first time period, and the valve adjustment opening decrease instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is controlled to decrease at a second rate within a second time period; According to the first valve adjustment instruction, controlling the action of the recirculation valve of the water supply pump; Wherein, determining the first valve adjustment instruction according to the actual flow rate of the water supply pump, the first flow rate threshold value and the second flow rate threshold value of the water supply pump includes: If the actual flow rate of the water supply pump is greater than the first flow rate threshold, determining that the first valve adjustment instruction is the valve adjustment opening degree reduction instruction; If the actual flow rate of the water supply pump is less than the second flow rate threshold, determining that the first valve adjustment instruction is the valve adjustment opening increase instruction; Wherein, before controlling the recirculation door of the water supply pump to operate, the method further comprises: If the actual flow rate of the water supply pump is less than the third flow rate threshold, the first valve adjustment instruction is locked, and a valve full-open instruction is generated to control the recirculation door action of the water supply pump, wherein the valve full-open instruction is used to indicate that the valve opening of the recirculation door is controlled to reach a maximum value within a third time period; If the actual flow rate of the water supply pump is not less than a third flow rate threshold, controlling the recirculation valve of the water supply pump to actuate according to the first valve adjustment instruction; The method further comprises: if the valve opening increase instruction or the valve full opening instruction is received during the process of reducing the valve opening of the recirculation valve of the water supply pump, controlling the valve opening to increase; If the valve opening reduction instruction is received during the process of increasing the valve opening of the recirculation valve of the water supply pump, the valve opening is still controlled to increase.

2. The method according to claim 1, characterized in that The method further comprises: Determining the first flow threshold value according to the first flow base and the first deviation allowance; The second flow threshold is determined according to the second flow base and the second deviation allowance.

3. The method according to claim 1, characterized in that The method further comprises: Based on the received valve control instruction and the current opening of the recirculation valve, the opening logic value of the recirculation valve is determined in real time, wherein the valve control instruction includes the first valve adjustment instruction, the valve full opening instruction, and the second valve adjustment instruction determined based on the recirculation opening preset value issued by the user and the current opening.

4. The method according to claim 3, characterized in that The method further comprises: When the unit where the water supply pump is located is not in the condition of load reduction due to auxiliary machine failure, if the deviation between the opening logic value at each moment in the fourth time period and the received opening feedback value of the recirculation door is greater than the opening deviation threshold, the control mode of controlling the recirculation door is manual mode.

5. The method according to claim 3, characterized in that: The method further comprises: When receiving an automatic command, if the opening logic value is consistent with the opening preset value issued by the user, the control mode of the recirculation door is the automatic mode.

6. The method according to claim 1, characterized in that The method further comprises: Real-time acquisition of flow rates fed back from at least two preset points on the outlet pipeline of the water supply pump; When the unit where the water supply pump is located is not in the condition of auxiliary machine failure and load reduction, if the difference in flow rates fed back from any two preset points is greater than the flow difference threshold, the control mode of controlling the recirculation door is manual mode.

7. The method according to claim 6, characterized in that The method further comprises: The average value of the flow rates fed back from at least two preset points on the outlet pipeline of the water supply pump obtained in real time is determined as the actual flow rate of the water supply pump.

8. The method according to claim 1, characterized in that The method further comprises: If the quality of the flow is judged to be a bad point, the control mode of controlling the recirculation door is a manual mode.

9. The method according to claim 1, characterized in that: The method further comprises: If the unit where the water feed pump is located also includes other water feed pumps, the first flow thresholds corresponding to different water feed pumps are controlled to be different values, and the second flow thresholds corresponding to different water feed pumps are controlled to be different values.

10. A water supply pump recirculation control device, characterized in that: include: An acquisition module is used to obtain the actual flow of the water supply pump; a first determining module, configured to determine a first valve adjustment instruction according to an actual flow rate of the water supply pump, a first flow rate threshold value of the water supply pump, and a second flow rate threshold value, wherein the first valve adjustment instruction includes a valve adjustment opening increase instruction and a valve adjustment opening decrease instruction, the valve adjustment opening increase instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is increased at a first rate within a first time period, and the valve adjustment opening decrease instruction is used to instruct that the valve opening of the recirculation valve of the water supply pump is decreased at a second rate within a second time period; A first control module, used for controlling the action of the recirculation valve of the water supply pump according to the first valve adjustment instruction; Wherein, the first determining module includes: A first determining submodule, configured to determine that the first valve adjustment instruction is the valve adjustment opening degree reduction instruction if the actual flow rate of the water supply pump is greater than the first flow rate threshold; a second determining submodule, configured to determine that the first valve adjustment instruction is the valve adjustment opening increase instruction if the actual flow rate of the water supply pump is less than the second flow rate threshold; Wherein, the first control module further includes: a first control submodule, configured to lock the first valve adjustment instruction and generate a valve full-open instruction to control the recirculation door action of the water supply pump if the actual flow rate of the water supply pump is less than a third flow rate threshold, wherein the valve full-open instruction is used to indicate that the valve opening of the recirculation door is controlled to reach a maximum value within a third time period; a second control submodule, configured to control the recirculation valve of the water supply pump to move according to the first valve adjustment instruction if the actual flow rate of the water supply pump is not less than a third flow rate threshold; The first control module is also used to control the valve opening to increase if the valve opening increase instruction or the valve full opening instruction is received during the process of decreasing the valve opening of the recirculation valve of the water supply pump; and to continue to control the valve opening to increase if the valve opening decrease instruction is received during the process of increasing the valve opening of the recirculation valve of the water supply pump.

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

12. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 9.

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