CN117627905A - Redundant control system for rotating speed of feed pump - Google Patents
Redundant control system for rotating speed of feed pump Download PDFInfo
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Abstract
The invention provides a redundant control system for the rotational speed of a feed pump, which comprises the following components: the device comprises a rotating speed redundancy control device, a variable frequency speed regulating device and a differential pressure measuring device, wherein the rotating speed redundancy control device comprises a controller and an output module, and a plurality of controllers and a plurality of output modules are arranged; the differential pressure measuring device is used for collecting the differential pressure of the water supply regulating valve, converting the differential pressure into a differential pressure signal and transmitting the differential pressure signal to the rotating speed redundancy control device; the rotating speed redundancy control device is used for determining a frequency control signal based on the differential pressure signal and transmitting the frequency control signal to the variable-frequency speed regulating device; the variable frequency speed regulating device is used for regulating the rotating speed of the water feeding pump based on the frequency control signal. The control system provided by the invention can realize automatic control of the rotation speed of the water feed pump, and meanwhile, the reliability of the control of the rotation speed of the water feed pump is higher and the robustness of the control system is stronger through multi-path redundancy configuration.
Description
Technical Field
The invention relates to the technical field of feed pumps, in particular to a feed pump rotating speed redundancy control system.
Background
Marine boilers are the core equipment of a marine power system, and their normal operation is critical to the safety and performance of the vessel. The feed pump rotational speed control system is an important component of a marine boiler feed water control system and is responsible for controlling and regulating the rotational speed of the feed pump to ensure that the water level in the boiler remains within a normal range.
The traditional water feeding pump rotating speed control system can meet the basic functional requirement of boiler water feeding control, however, when instruments, an actuating mechanism, pipelines and the like in the system are in failure, the water level control can be invalid, so that the boiler is in a dry pot or full water condition, and the whole power system is seriously affected.
Disclosure of Invention
The invention provides a water feed pump rotating speed redundant control system which is used for solving the defect that the control failure occurs in the water feed pump rotating speed control system in the prior art under the fault.
The invention provides a redundant control system for the rotational speed of a feed pump, which comprises the following components: the device comprises a rotating speed redundancy control device, a variable frequency speed regulating device and a differential pressure measuring device, wherein the rotating speed redundancy control device comprises a controller and an output module, and a plurality of controllers and a plurality of output modules are arranged;
the differential pressure measuring device is used for collecting the differential pressure of the water supply regulating valve, converting the differential pressure into a differential pressure signal and transmitting the differential pressure signal to the rotating speed redundancy control device;
the rotating speed redundancy control device is used for determining a frequency control signal based on the differential pressure signal and transmitting the frequency control signal to the variable-frequency speed regulating device;
the variable-frequency speed regulating device is used for regulating the rotating speed of the water supply pump based on the frequency control signal.
According to the water supply pump rotating speed redundancy control system provided by the invention, two controllers and two output modules are arranged, the two controllers are standby, the two output modules are standby, and the rotating speed redundancy control device further comprises an input module;
the input module is used for processing the differential pressure signal and transmitting the processed signal to the controller;
the controller is used for determining an actual differential pressure value based on the processed signal, comparing the actual differential pressure value with a differential pressure set value to obtain a deviation value, determining a frequency given value of the frequency converter by using the deviation value, and transmitting the frequency given value of the frequency converter to the output module;
the output module is used for converting the frequency given value of the frequency converter into the frequency control signal and transmitting the frequency control signal to the frequency conversion speed regulating device.
According to the water supply pump rotational speed redundancy control system provided by the invention, the rotational speed redundancy control device further comprises a power supply module, wherein the power supply module is used for providing power for the input module, the controller and the output module, two power supply modules are arranged, and the input of the two power supply modules is one path of AC220V power supply respectively.
According to the water supply pump rotational speed redundancy control system provided by the invention, the rotational speed redundancy control device further comprises a DC24V power input, and the DC24V power input is used for providing power for the input module, the controller and the output module.
According to the redundant control system for the rotational speed of the feed pump, the differential pressure measuring device comprises two differential pressure transmitters, and the two differential pressure transmitters are used for collecting the differential pressure of the same feed water regulating valve.
According to the water supply pump rotating speed redundancy control system provided by the invention, the water supply pump rotating speed redundancy control system further comprises a water level acquisition device, one end of the water level acquisition device is connected with a boiler, the other end of the water level acquisition device is connected with the rotating speed redundancy control device, the water supply pump is connected with the boiler through a water supply pipeline, and the water supply regulating valve is arranged on the water supply pipeline;
the water level acquisition device is used for acquiring the water level of the boiler and converting the water level into a water level signal to be transmitted to the rotating speed redundancy control device;
the rotational speed redundancy control device is used for determining a frequency control signal based on the water level signal under the condition that the water supply regulating valve is abnormal.
The invention provides a water supply pump rotating speed redundant control system, which also comprises a monitoring device and a rotating speed measuring device;
one end of the monitoring device is connected with the variable frequency speed regulating device, the other end of the monitoring device is connected with the rotating speed redundancy control device, and the monitoring device is used for monitoring a frequency feedback signal of the variable frequency speed regulating device and transmitting the frequency feedback signal to the rotating speed redundancy control device;
one end of the rotation speed measuring device is connected with the water feeding pump, the other end of the rotation speed measuring device is connected with the rotation speed redundancy control device, and the rotation speed measuring device is used for measuring the rotation speed of the water feeding pump, converting the rotation speed into a rotation speed signal and transmitting the rotation speed signal to the rotation speed redundancy control device;
the rotating speed redundancy control device is used for sending out an alarm signal under the condition that the difference between the frequency feedback signal and the rotating speed signal exceeds a preset threshold value.
According to the water supply pump rotational speed redundancy control system provided by the invention, the monitoring device is also used for acquiring the accumulated running time of the frequency converter in the frequency conversion speed regulating device and transmitting the accumulated running time to the rotational speed redundancy control device;
the rotational speed redundant control device is also used for controlling the starting or stopping of the water feeding pump based on the accumulated running time.
The invention also provides a redundant control method for the rotational speed of the feed pump, which comprises the following steps:
collecting the pressure difference of a water supply regulating valve, and converting the pressure difference into a pressure difference signal;
processing the differential pressure signal, determining an actual differential pressure value based on the processed signal, and comparing the actual differential pressure value with a differential pressure set value to obtain a differential pressure value;
and determining a frequency given value of the frequency converter by using the deviation value, converting the frequency given value of the frequency converter into a frequency control signal, and adjusting the rotating speed of the water supply pump based on the frequency control signal.
The invention provides a method for controlling the rotational speed redundancy of a feed pump, which further comprises the following steps:
collecting the water level of a boiler and converting the water level into a water level signal;
and under the condition that the abnormality of the water supply regulating valve is detected, determining a frequency control signal by using the water level signal, and regulating the rotating speed of the water supply pump based on the frequency control signal.
The invention provides a water feed pump rotating speed redundancy control system, which is characterized in that a differential pressure measuring device is used for collecting the differential pressure of a water feed regulating valve, converting the differential pressure into a differential pressure signal and transmitting the differential pressure signal to a rotating speed redundancy control device, the rotating speed redundancy control device is used for determining a frequency control signal based on the differential pressure signal and transmitting the frequency control signal to a variable frequency speed regulating device, so that the variable frequency speed regulating device is used for regulating the rotating speed of a water feed pump based on the frequency control signal, and the automatic regulation control of the rotating speed of the water feed pump is realized. In addition, the rotating speed redundancy control device comprises a plurality of controllers and a plurality of output modules, and can enable the rotating speed control reliability of the water feeding pump to be higher through redundant configuration such as controller redundancy and output module redundancy, and the robustness of a control system is stronger, so that the situation that the rotating speed redundancy control system of the water feeding pump fails in a control mode is prevented.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a redundant control system for the rotational speed of a feed pump according to the present invention;
FIG. 2 is a second schematic diagram of a redundant control system for rotational speed of a feed pump according to the present invention;
FIG. 3 is a third schematic diagram of a redundant control system for rotational speed of a feed pump according to the present invention;
fig. 4 is a schematic flow chart of a method for controlling the rotational speed redundancy of a feed pump.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The water supply pump rotating speed control system is an important component of the marine boiler water supply control system, and the system fault can cause the condition that the boiler is dry or full of water, thereby having serious influence on the whole power system. For example, when the rotation speed control device itself fails (such as a controller failure, a signal input module, an output module and other electrical components failure, etc.), the control signal cannot be output correctly, even no control signal is output, so that the water level control fails, and the system operation will deviate from the normal working condition seriously. In view of the above, the embodiment of the invention provides a redundant control system for the rotational speed of a feed pump, so as to overcome the defects.
FIG. 1 is a schematic diagram of a redundant control system for rotational speed of a feed pump according to the present invention, as shown in FIG. 1, the system includes: the device comprises a rotating speed redundancy control device 10, a variable frequency speed regulating device 20 and a differential pressure measuring device 30, wherein the rotating speed redundancy control device 10 comprises a controller and an output module, and a plurality of controllers and a plurality of output modules are arranged;
the differential pressure measuring device 30 is used for collecting the differential pressure of the water supply regulating valve 50, converting the differential pressure into a differential pressure signal and transmitting the differential pressure signal to the rotating speed redundancy control device 10;
the rotational speed redundancy control device 10 is configured to determine a frequency control signal based on the differential pressure signal, and transmit the frequency control signal to the variable frequency speed control device 20;
the variable frequency speed control device 20 is used for adjusting the rotation speed of the feed pump 40 based on the frequency control signal.
The feed pump 40 is usually connected to the boiler via a feed pipe, and the feed adjusting valve 50 is provided in the feed pipe between the feed pump 40 and the boiler to control the feed water flow rate of the boiler, and the water level of the boiler can be controlled within a predetermined range by adjusting the opening degree of the feed adjusting valve 50. In the system, the water feed pump 40 is used for pumping water into a water feed pipeline, and enters the boiler after passing through the water feed regulating valve 50, and the variable-frequency speed regulating device 20 can regulate the rotating speed of the water feed pump 40 so as to change the outlet pressure of the water feed pump 40, thereby meeting the water feed amount required by the boiler under various working conditions. Here, the control signal of the variable-frequency governor 20 is provided by the rotational speed redundancy control device 10.
Specifically, one end of the differential pressure measuring device 30 is connected with the water supply regulating valve 50, and the other end is connected with the rotational speed redundancy control device 10, and can be used for collecting the front and rear differential pressure of the water supply regulating valve 50, converting the differential pressure into a differential pressure signal and transmitting the differential pressure signal to the rotational speed redundancy control device 10. Here, the differential pressure signal may be an analog signal (e.g., a voltage or current signal) or a digital signal.
The rotational speed redundancy control device 10 may process and analyze the differential pressure signal through the controller after receiving the differential pressure signal, thereby determining a frequency control signal based on the differential pressure signal, and transmitting the frequency control signal to the variable frequency speed control device 20. Here, the rotational speed redundancy control device 10 includes a plurality of controllers and a plurality of output modules, and can implement controller redundancy and output module redundancy configuration, when one of the controllers or the output modules fails, the other controllers or the output modules can take over the work, so that the controllers can calculate normally, and meanwhile, the output signals are ensured to be stable and reliable.
The variable frequency governor 20 may include a frequency converter, which is a device for adjusting the rotational speed of the feed pump 40. After receiving the frequency control signal, the variable frequency speed control device 20 can adjust the output frequency of the frequency converter based on the frequency control signal, thereby realizing the rotation speed control of the water feed pump 40.
The invention provides a water feed pump rotating speed redundancy control system, which is characterized in that a differential pressure measuring device is used for collecting the differential pressure of a water feed regulating valve, converting the differential pressure into a differential pressure signal and transmitting the differential pressure signal to a rotating speed redundancy control device, the rotating speed redundancy control device is used for determining a frequency control signal based on the differential pressure signal and transmitting the frequency control signal to a variable frequency speed regulating device, so that the variable frequency speed regulating device is used for regulating the rotating speed of a water feed pump based on the frequency control signal, and the automatic regulation control of the rotating speed of the water feed pump is realized. In addition, the rotating speed redundancy control device comprises a plurality of controllers and a plurality of output modules, and can enable the rotating speed control reliability of the water feeding pump to be higher through redundant configuration such as controller redundancy and output module redundancy, and the robustness of a control system is stronger, so that the situation that the rotating speed redundancy control system of the water feeding pump fails in a control mode is prevented.
Based on the above embodiment, two controllers and two output modules are provided, the two controllers are standby, the two output modules are standby, and the rotational speed redundancy control device 10 further includes an input module;
the input module is used for processing the differential pressure signal and transmitting the processed signal to the controller;
the controller is used for determining an actual pressure difference value based on the processed signal, comparing the actual pressure difference value with a pressure difference set value to obtain a deviation value, determining a frequency given value of the frequency converter by using the deviation value, and transmitting the frequency given value of the frequency converter to the output module;
the output module is used for converting the frequency given value of the frequency converter into a frequency control signal and transmitting the frequency control signal to the variable-frequency speed regulating device 20.
Specifically, the rotational speed redundant control device 10 adopts the configuration of two redundant controllers, the two redundant controllers can monitor the heartbeat state mutually, once one of the two redundant controllers fails, the other redundant controller can take over the work and send out an alarm signal at the same time, so that the controllers can process and calculate normally. Meanwhile, the rotational speed redundancy control device 10 adopts the configuration of two output modules, the two output modules are mutually redundant, one of the two output modules fails, and the other output module can take over the work, so that the stability and reliability of output signals are ensured.
The rotational speed redundancy control apparatus 10 further includes an input module that receives the differential pressure signal from the differential pressure measurement device 30 and processes, amplifies, or converts the differential pressure signal to transmit the processed signal to the controller for further analysis. After receiving the processed signal, the controller can determine an actual differential pressure value based on the processed signal, compare the actual differential pressure value with a differential pressure set value to obtain a deviation value, and determine a frequency given value of the frequency converter according to the deviation value. Here, the differential pressure set value refers to a differential pressure value preset according to specific application requirements and system operation conditions, and in general, the differential pressure set value is selected in consideration of performance and flow rate requirements of the feed water adjusting valve 50, for example, the differential pressure set value may be between several hundred and several kilopascals.
The controller can be realized by adopting methods such as proportional control, proportional-integral-derivative control and the like when calculating the frequency given value of the frequency converter according to the deviation value. For example, the proportional control can directly calculate the output frequency of the frequency converter according to the deviation; proportional-integral control not only considers the integral accumulation of the deviation according to the deviation magnitude, but also considers the integral accumulation of the deviation so as to more accurately control the output frequency of the frequency converter; proportional-integral-derivative control considers not only the magnitude of the deviation and the integral accumulation but also the rate of change of the deviation to respond and stabilize the control more quickly.
After determining the frequency set point of the frequency converter, the frequency set point can be converted into a frequency control signal by an output module, and the frequency control signal can be an analog signal (such as a voltage or current signal) for adjusting the output frequency of the frequency converter, so that the rotating speed control of the water feeding pump 40 is realized.
Based on any of the above embodiments, fig. 2 is a second schematic structural diagram of a redundant control system for the rotational speed of a water pump according to the present invention, as shown in fig. 2, the redundant control device 10 for rotational speed further includes a power module, where the power module is configured to provide power to an input module, a controller, and an output module, and two power modules are provided, and inputs of the two power modules are respectively one AC220V power. The rotational speed redundancy control 10 further includes a DC24V power input, the DC24V power input for providing power to the input module, the controller, and the output module.
It should be noted that, considering that the conventional water pump rotation speed control system generally adopts a one-way power supply device, once an external input power supply fails or a self power supply module fails, the rotation speed control device cannot be powered, so that the rotation speed control device fails, and a control signal cannot be output. Therefore, the rotational speed redundancy control device 10 according to the embodiment of the invention adopts the three-way power supply mode, so that the rotational speed redundancy control device 10 can be ensured to supply power stably and reliably.
Specifically, the rotational speed redundancy control device 10 adopts a three-way power supply mode, wherein two paths of power supplies are input by AC220V, and DC24V power is provided for other components after passing through a power supply module inside the device. The two power supplies can come from different power supply devices, and when an external single-circuit AC220V power supply fails, the other power supply can normally supply power to the rotating speed redundancy control device 10.
In addition, the device is also connected with an external DC24V power input, and the power module conversion is not needed inside the equipment. In the embodiment of the invention, three power supplies of the rotational speed redundancy control device 10 are of different power supply types, power supply equipment is different from each other and the power systems are different, so that the purpose of redundant power supply can be achieved, common cause faults possibly caused by the same power system can be avoided, stable power supply of the rotational speed redundancy control device 10 is ensured, and the control system is stable and reliable in operation.
Based on any of the above embodiments, the differential pressure measurement device 30 includes two differential pressure transmitters, both of which are used to collect the differential pressure of the same feed water regulating valve 50.
It should be noted that, considering that the monitoring signal may be abnormal due to various modes such as power failure of the meter, signal line fault, signal interference, etc., after the monitoring signal is interfered, the output value of the rotation speed control device will deviate from the normal value, which causes system disorder. Therefore, in the embodiment of the invention, two differential pressure transmitters are arranged before and after the water supply regulating valve 50, so that the differential pressure before and after the water supply regulating valve 50 can be detected, and the redundancy of the control target of the system is ensured.
Specifically, when the water supply regulating valve 50 works normally, the control target of the water supply pump rotational speed redundancy control system is the front-rear differential pressure of the water supply regulating valve 50, the system is provided with two differential pressure transmitters for the water supply regulating valve 50, one differential pressure signal is used as the control target by the control system when the fault of the water supply regulating valve 50 is detected, and therefore the control target signal redundancy is ensured.
Here, a differential pressure transmitter (Differential Pressure Transmitter) is a sensor device for measuring a pressure difference in a fluid or gas. It converts the pressure difference into a standard signal output (typically an electrical signal) by measuring the pressure difference between the two locations for monitoring, control and recording.
Based on any one of the above embodiments, the system further includes a water level acquisition device 70, one end of the water level acquisition device 70 is connected with the boiler 60, the other end is connected with the rotational speed redundancy control device 10, the water feed pump 40 is connected with the boiler 60 through a water feed pipeline, and the water feed regulating valve 50 is arranged on the water feed pipeline;
the water level acquisition device 70 is used for acquiring the water level of the boiler 60, converting the water level into a water level signal and transmitting the water level signal to the rotating speed redundancy control device 10;
the rotational speed redundancy control 10 is configured to determine a frequency control signal based on the water level signal in the event of abnormality of the feed water regulator valve 50.
Specifically, when the water supply regulating valve 50 works abnormally, the water supply regulating valve 50 will send out fault signals such as turn-off and turn-on, and when the system monitors that the water supply regulating valve 50 is abnormal, the water supply regulating valve 50 cannot act or fails to act, at this time, the front-rear pressure difference of the water supply regulating valve 50 cannot serve as a control target of the water supply pump rotational speed redundancy control system, in this case, the system takes the water level signal of the boiler 60 as the control target to relieve disasters caused by the system abnormality.
Here, the water level collecting device 70 may be a water level gauge, which determines the water level by measuring the position of a float or a float ball using a float or float ball principle; or an ultrasonic water level gauge, wherein an ultrasonic sensor is used for transmitting and receiving an acoustic wave signal, and the water level is determined by measuring the propagation time and distance of the acoustic wave; but also a water level electrode, which is installed inside the boiler 60, and the resistance or capacitance change between the electrode and the water level is measured to determine the water level. These devices may be used alone or in combination to improve the accuracy and reliability of water level acquisition, and embodiments of the present invention are not particularly limited. It will be appreciated that in the event of an anomaly in the feedwater regulation valve 50, the speed redundancy control 10 may determine a frequency control signal based on the water level signal to ensure that the speed of the feedwater pump 40 is able to be adjusted in time to maintain the boiler 60 water level within a normal range. After receiving the water level signal, the rotational speed redundancy control device 10 may process the water level signal through an input module, for example, perform operations such as filtering, calibration, and possible error correction on the water level signal, so as to ensure that accurate and reliable water level data is obtained; based on the change in the water level signal, the controller may generate a corresponding frequency control signal that will be used to adjust the rotational speed of the feedwater pump 40 to control the amount of feedwater to maintain a steady water level in the boiler 60.
Preferably, in the event of an abnormality of the feed water regulating valve 50, the rotational speed redundancy control 10 may also determine the cause of the abnormality from the water level signal and adjust the frequency control signal accordingly. For example, if the water level continues to drop, which may mean that the feed water regulating valve 50 is not completely closed or there is a problem of leakage, etc., the apparatus may increase the rotation speed of the feed water pump 40 by increasing the frequency control signal, increasing the amount of feed water. Conversely, if the water level continues to rise, which may mean that the water supply regulator valve 50 is not completely closed or there is a problem such as clogging, the apparatus may reduce the rotational speed of the water supply pump 40 by reducing the frequency control signal, and reduce the amount of water supply.
In the embodiment of the invention, by determining the frequency control signal based on the water level signal, the rotational speed redundancy control device 10 can automatically adjust the rotational speed of the feed pump 40 under the condition that the feed water adjusting valve 50 is abnormal, thereby ensuring stable and safe operation of the water level of the boiler 60.
Based on any of the above embodiments, fig. 3 is a schematic diagram of a third embodiment of a redundant control system for a rotational speed of a water pump according to the present invention, as shown in fig. 3, where the system further includes a monitoring device 80 and a rotational speed measuring device 90;
one end of the monitoring device 80 is connected with the variable frequency speed regulating device 20, the other end of the monitoring device 80 is connected with the rotating speed redundancy control device 10, and the monitoring device 80 is used for monitoring a frequency feedback signal of the variable frequency speed regulating device 20 and transmitting the frequency feedback signal to the rotating speed redundancy control device 10;
one end of the rotation speed measuring device 90 is connected with the water feed pump 40, the other end is connected with the rotation speed redundancy control device 10, and the rotation speed measuring device 90 is used for measuring the rotation speed of the water feed pump 40 and converting the rotation speed into a rotation speed signal to be transmitted to the rotation speed redundancy control device 10;
the rotational speed redundancy control device 10 is configured to send out an alarm signal when it is detected that the difference between the frequency feedback signal and the rotational speed signal exceeds a preset threshold.
Specifically, when the system works normally, the rotational speed redundancy control device 10 sends a frequency control signal of the water feeding pump 40 to the frequency converter of the variable frequency speed regulating device 20, and when the monitoring device 80 monitors that the frequency feedback signal of the control unit of the variable frequency speed regulating device 20 is abnormal, the rotational speed signal of the water feeding pump 40 is used as an action feedback signal of the executing mechanism. If the monitoring device 80 monitors that the difference between the frequency feedback signal of the control unit and the rotational speed signal of the water feeding pump 40 is large, that is, if the difference exceeds the preset threshold, an alarm signal can be sent to the upper system, so as to provide basic data of operation technical support for an operator.
Here, the frequency feedback signal is a feedback signal in the variable frequency speed adjusting device 20, and is used to reflect the actual value of the frequency of the output power of the frequency converter. In the redundant control system of the rotation speed of the feed pump, the variable frequency speed regulating device 20 is responsible for regulating the rotation speed of the feed pump 40, and the frequency feedback signal is used for monitoring and feeding back the accuracy and stability of the output frequency of the frequency converter.
The preset threshold value is a threshold value or a limit value preset in the rotational speed redundancy control apparatus 10. When the difference between the frequency feedback signal and the rotation speed signal exceeds the preset threshold, the rotation speed redundancy control device 10 sends out an alarm signal. The setting of the preset threshold value can be determined according to the requirements and actual conditions of the system, and is usually set according to the theoretical difference between the rotating speed signal and the frequency feedback signal or the normal working range.
It will be appreciated that each feed pump 40 may employ a rotational speed measuring device 90, where the rotational speed measuring device 90 includes a tachometer disposed adjacent the feed pump 40 and a primary meter probe mounted to the feed pump 40. The rotational speed measuring device 90 may display the rotational speed of the feed pump 40, or may output a 4mA-20mA current signal to the rotational speed redundancy control device 10.
In the embodiment of the present invention, the rotational speed redundancy control device 10 can determine whether the working state of the variable frequency speed control device 20 is normal by monitoring and comparing the difference between the frequency feedback signal and the rotational speed signal. If the difference exceeds a preset threshold, which means that the variable frequency speed regulating device 20 may have a fault or abnormality, the rotational speed redundancy control device 10 will send an alarm signal to remind an operator to overhaul and process. Thus, the problems of the variable frequency speed regulating device 20 can be found and solved in time, the rotation speed control and the water level stability of the water feeding pump 40 are ensured, and the normal operation and the safety of the boiler 60 are maintained.
Based on any of the above embodiments, the monitoring device 80 is further configured to obtain an accumulated operation time of the frequency converter in the variable frequency speed regulating device 20, and transmit the accumulated operation time to the rotational speed redundancy control device 10;
the rotational speed redundancy control apparatus 10 is also configured to control the start or stop of the feed pump 40 based on the accumulated operating time.
Specifically, the integrated operation time of the frequency converter refers to the total operation time of the variable frequency speed adjusting device 20 (including the frequency converter) since installation and use, which reflects the service life and the integrated operation time of the frequency converter. The acquisition of the cumulative operation time of the frequency converter may be achieved by the monitoring device 80, and the monitoring device 80 may record the start-stop time of the frequency converter and accumulate the start-stop time to obtain the cumulative operation time, for example, by monitoring the switching state of the frequency converter or recording the time of the output frequency of the frequency converter.
In the automatic operation of the water feed pump 40, the start and stop of the water feed pump 40 are controlled according to the accumulated time of the operation of the frequency converter, namely, the water feed pump 40 with the shortest accumulated operation time is started when the pump is started again each time; when the pump is stopped, the feed pump 40 having the longest cumulative operating time is stopped.
In the embodiment of the invention, the running reliability and the safety of the equipment can be improved by acquiring the accumulated running time of the frequency converter and controlling based on the accumulated running time, and meanwhile, the intelligent control of the water supply pump 40 is realized, so that higher energy efficiency and economic benefit are brought.
Based on any of the above embodiments, fig. 4 is a schematic flow chart of a method for controlling rotational speed redundancy of a water pump according to the present invention, as shown in fig. 4, where the method includes:
step 410, collecting the pressure difference of the water supply regulating valve, and converting the pressure difference into a pressure difference signal;
step 420, processing the differential pressure signal, determining an actual differential pressure value based on the processed signal, and comparing the actual differential pressure value with a differential pressure set value to obtain a differential value;
step 430, determining a frequency given value of the frequency converter by using the deviation value, converting the frequency given value of the frequency converter into a frequency control signal, and adjusting the rotating speed of the water feeding pump based on the frequency control signal.
The invention provides a redundant control method for the rotating speed of a water supply pump, which is characterized in that the differential pressure of a water supply regulating valve is collected, the differential pressure is converted into a differential pressure signal, the differential pressure signal is processed, an actual differential pressure value is determined based on the processed signal, the actual differential pressure value is compared with a differential pressure set value to obtain a differential value, a frequency set value of a frequency converter is determined by using the differential value, the frequency set value of the frequency converter is converted into a frequency control signal, and the rotating speed of the water supply pump is regulated based on the frequency control signal, so that the automatic regulation and control of the rotating speed of the water supply pump are realized.
Based on any of the above embodiments, the method further comprises:
collecting the water level of a boiler and converting the water level into a water level signal;
and under the condition that the abnormality of the water supply regulating valve is detected, determining a frequency control signal by using the water level signal, and regulating the rotating speed of the water supply pump based on the frequency control signal.
Based on any of the above embodiments, the method further comprises:
measuring the rotating speed of a water feeding pump and converting the rotating speed into a rotating speed signal;
and sending out an alarm signal under the condition that the difference between the frequency feedback signal of the variable-frequency speed regulating device and the rotating speed signal exceeds a preset threshold value.
Based on any of the above embodiments, the method further comprises:
acquiring accumulated running time of a frequency converter in the frequency conversion speed regulating device;
and controlling the water feed pump to start or stop based on the accumulated running time.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A feed pump rotational speed redundant control system, comprising: the device comprises a rotating speed redundancy control device, a variable frequency speed regulating device and a differential pressure measuring device, wherein the rotating speed redundancy control device comprises a controller and an output module, and a plurality of controllers and a plurality of output modules are arranged;
the differential pressure measuring device is used for collecting the differential pressure of the water supply regulating valve, converting the differential pressure into a differential pressure signal and transmitting the differential pressure signal to the rotating speed redundancy control device;
the rotating speed redundancy control device is used for determining a frequency control signal based on the differential pressure signal and transmitting the frequency control signal to the variable-frequency speed regulating device;
the variable-frequency speed regulating device is used for regulating the rotating speed of the water supply pump based on the frequency control signal.
2. The water supply pump rotational speed redundancy control system according to claim 1, wherein two controllers and two output modules are provided, the two controllers are standby, the two output modules are standby, and the rotational speed redundancy control device further comprises an input module;
the input module is used for processing the differential pressure signal and transmitting the processed signal to the controller;
the controller is used for determining an actual differential pressure value based on the processed signal, comparing the actual differential pressure value with a differential pressure set value to obtain a deviation value, determining a frequency given value of the frequency converter by using the deviation value, and transmitting the frequency given value of the frequency converter to the output module;
the output module is used for converting the frequency given value of the frequency converter into the frequency control signal and transmitting the frequency control signal to the frequency conversion speed regulating device.
3. The water supply pump rotational speed redundancy control system according to claim 2, wherein the rotational speed redundancy control device further comprises a power module, the power module is used for providing power for the input module, the controller and the output module, two power modules are provided, and the input of the two power modules is one path of AC220V power respectively.
4. The feedwater pump rotational speed redundancy control system of claim 3, wherein the rotational speed redundancy control device further comprises a DC24V power input, the DC24V power input for providing power to the input module, the controller, and the output module.
5. The feed pump rotational speed redundancy control system of claim 1, wherein the differential pressure measurement device comprises two differential pressure transmitters, both of which are used to collect differential pressure of the same feed regulating valve.
6. The redundant control system for the rotational speed of a feed pump according to any one of claims 1 to 5, further comprising a water level acquisition device, one end of the water level acquisition device being connected to a boiler, the other end being connected to the redundant control device for rotational speed, the feed pump being connected to the boiler through a feed pipe, the feed regulating valve being provided on the feed pipe;
the water level acquisition device is used for acquiring the water level of the boiler and converting the water level into a water level signal to be transmitted to the rotating speed redundancy control device;
the rotational speed redundancy control device is used for determining a frequency control signal based on the water level signal under the condition that the water supply regulating valve is abnormal.
7. The feedwater pump rotational speed redundant control system of any of claims 1 to 5, further comprising a monitoring device and a rotational speed measurement device;
one end of the monitoring device is connected with the variable frequency speed regulating device, the other end of the monitoring device is connected with the rotating speed redundancy control device, and the monitoring device is used for monitoring a frequency feedback signal of the variable frequency speed regulating device and transmitting the frequency feedback signal to the rotating speed redundancy control device;
one end of the rotation speed measuring device is connected with the water feeding pump, the other end of the rotation speed measuring device is connected with the rotation speed redundancy control device, and the rotation speed measuring device is used for measuring the rotation speed of the water feeding pump, converting the rotation speed into a rotation speed signal and transmitting the rotation speed signal to the rotation speed redundancy control device;
the rotating speed redundancy control device is used for sending out an alarm signal under the condition that the difference between the frequency feedback signal and the rotating speed signal exceeds a preset threshold value.
8. The feed pump rotational speed redundancy control system of claim 7, wherein the monitoring device is further configured to obtain an accumulated running time of a frequency converter in the variable frequency speed regulating device, and transmit the accumulated running time to the rotational speed redundancy control device;
the rotational speed redundant control device is also used for controlling the starting or stopping of the water feeding pump based on the accumulated running time.
9. A method for redundant control of a feed pump rotational speed, comprising:
collecting the pressure difference of a water supply regulating valve, and converting the pressure difference into a pressure difference signal;
processing the differential pressure signal, determining an actual differential pressure value based on the processed signal, and comparing the actual differential pressure value with a differential pressure set value to obtain a differential pressure value;
and determining a frequency given value of the frequency converter by using the deviation value, converting the frequency given value of the frequency converter into a frequency control signal, and adjusting the rotating speed of the water supply pump based on the frequency control signal.
10. The feedwater pump rotational speed redundancy control method of claim 9, further comprising:
collecting the water level of a boiler and converting the water level into a water level signal;
and under the condition that the abnormality of the water supply regulating valve is detected, determining a frequency control signal by using the water level signal, and regulating the rotating speed of the water supply pump based on the frequency control signal.
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| US20120183413A1 (en) * | 2010-12-06 | 2012-07-19 | Hitachi, Ltd. | Reactor Feedwater Pump Control System |
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