Water supply device and mixed speed control method, device and storage medium thereof

Abstract

The application discloses a water supply device and a mixed speed regulation control method and device thereof and a storage medium, wherein the water supply device comprises a boiler, a high-pressure heater and a first water supply device and at least one second water supply device connected in parallel, the first water supply device comprises a first water supply pump and a hydraulic coupler, the second water supply device comprises a second water supply pump and a variable frequency motor, the method comprises the following steps: adjusting the rotating speed of the first water supply pump by configuring the scoop pipe opening degree of the hydraulic coupler, and adjusting the rotating speed of the second water supply pump by configuring the operating frequency of the variable frequency motor; heating the pumped water through the high-pressure heater, and conducting convection on the hot water output by the high-pressure heater through the boiler to output superheated steam; acquiring the drum water level of the boiler; determining the target rotating speed according to the drum water level, and determining the scoop pipe opening degree instruction and the variable frequency instruction according to the target rotating speed to control the scoop pipe opening degree of the hydraulic coupler and the operating frequency of the variable frequency motor, so that the drum water level is in a preset water level interval.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of driving of a boiler feed pump of a thermal power plant, and in particular to a mixed speed regulation control method of a feed water equipment, a feed water equipment, a computer readable storage medium and a mixed speed regulation control device of the feed water equipment. BACKGROUND

[0002] At present, the mainstream configuration of most power plant feed water pumps is two of the following two: two-use-one-backup configuration, each feed water pump is configured according to 50% of the boiler capacity, and liquid-coupled speed regulation mode; or one-use-one-backup configuration, each feed water pump is configured according to 100% of the boiler capacity, and liquid-coupled speed regulation mode. Among them, for the two-use-one-backup configuration system, the feed water pump modification scheme is generally to modify two of the feed water pumps and retain one feed water pump with a power frequency liquid-coupled control, so that the feed water pump will often encounter the case of one variable frequency drag operation and the other power frequency liquid-coupled speed regulation operation during normal operation.

[0003] However, due to the different response speed, linearity and speed regulation accuracy of variable frequency speed regulation and liquid-coupled speed regulation, great interference is caused to the feed water automatic control, for example, it can cause great fluctuation of the steam drum water level line, the steam drum boiler feed water control fails, the unit cannot perform AGC (Automatic Generation Control), and in severe cases, it can even cause steam drum water level alarm, which brings great hidden dangers to the normal operation of the power plant and the safety of the unit. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, a first object of the present application is to provide a mixed speed regulation control method of a feed water equipment, which can keep the rotation speed of a first feed water pump and the rotation speed of a second feed water pump in synchronous regulation, so that the steam drum water level is in a preset water level interval, thereby ensuring reliable operation of the feed water equipment.

[0005] A second object of the present application is to provide a feed water equipment.

[0006] A third object of the present application is to provide a computer readable storage medium.

[0007] A fourth object of the present application is to provide a mixed speed regulation control device of a feed water equipment.

[0008] To achieve the above object, the application provides a mixed speed regulation control method of a water supply device, wherein the water supply device comprises a boiler, a high-pressure heater, a first water supply device and at least one second water supply device connected in parallel, the first water supply device comprises a first water supply pump and a hydraulic coupler connected with the first water supply pump, the second water supply device comprises a second water supply pump and a variable frequency motor connected with the second water supply pump, the method comprises the following steps: adjusting the rotating speed of the first water supply pump by configuring the scoop pipe opening degree of the hydraulic coupler, and adjusting the rotating speed of the second water supply pump by configuring the operating frequency of the variable frequency motor; heating the water pumped by the first water supply pump and the second water supply pump by the high-pressure heater, and heating the hot water output by the high-pressure heater by the boiler to output superheated steam; obtaining the drum water level of the boiler; determining the target rotating speed according to the drum water level, and determining the scoop pipe opening degree instruction and the variable frequency instruction according to the target rotating speed, and controlling the scoop pipe opening degree of the hydraulic coupler according to the scoop pipe opening degree instruction, and controlling the operating frequency of the variable frequency motor according to the variable frequency instruction, so that the rotating speed of the first water supply pump and the rotating speed of the second water supply pump are synchronously adjusted, and the drum water level is in a preset water level interval.

[0009] The mixed speed regulation control method of the water supply device provided by the application adjusts the rotating speed of the first water supply pump by configuring the scoop pipe opening degree of the hydraulic coupler, adjusts the rotating speed of the second water supply pump by configuring the operating frequency of the variable frequency motor, heats the water pumped by the first water supply pump and the second water supply pump by the high-pressure heater, heats the hot water output by the high-pressure heater by the boiler to output superheated steam, obtains the drum water level of the boiler, determines the target rotating speed according to the drum water level, determines the scoop pipe opening degree instruction and the variable frequency instruction according to the target rotating speed, controls the scoop pipe opening degree of the hydraulic coupler according to the scoop pipe opening degree instruction, and controls the operating frequency of the variable frequency motor according to the variable frequency instruction, so that the rotating speed of the first water supply pump and the rotating speed of the second water supply pump are synchronously adjusted, and the drum water level is in a preset water level interval. Thus, the reliable operation of the water supply device is ensured.

[0010] In addition, the mixed speed regulation control method of the water supply device according to the above-mentioned embodiments of the application can have the following additional technical features:

[0011] According to an embodiment of the application, the target rotating speed is determined according to the drum water level, which comprises the following steps: obtaining the set drum water level of the boiler, determining the water level difference between the set drum water level and the drum water level, and determining the target rotating speed according to the water level difference.

[0012] According to one embodiment of the present application, the target rotating speed is determined according to the steam drum water level, comprising: obtaining the steam flow of the superheated steam, and obtaining the hot water flow of the high-pressure heater output, and determining the flow difference value according to the steam flow and the hot water flow; determining the target flow according to the steam drum water level, and determining the target rotating speed according to the target flow and the flow difference value.

[0013] According to one embodiment of the present application, the spoon tube opening degree instruction and the frequency conversion instruction are determined according to the target rotating speed, comprising: obtaining the historical operation data of the first feed water device and the historical operation data of the second feed water device; analyzing and processing the historical operation data of the first feed water device and the historical operation data of the second feed water device to determine the matching relationship between the spoon tube opening degree and the rotating speed of the feed water pump; determining the spoon tube opening degree instruction and the frequency conversion instruction according to the target rotating speed and the matching relationship.

[0014] According to one embodiment of the present application, the spoon tube opening degree instruction and the frequency conversion instruction are determined according to the target rotating speed, comprising: obtaining the piecewise function relationship between the spoon tube opening degree and the rotating frequency; determining one of the spoon tube opening degree instruction and the frequency conversion instruction according to the target rotating speed, and converting one of the spoon tube opening degree instruction and the frequency conversion instruction according to the piecewise function relationship to obtain the other one of the spoon tube opening degree instruction and the frequency conversion instruction.

[0015] According to one embodiment of the present application, after the rotating speed of the first feed water pump and the rotating speed of the second feed water pump are kept synchronous adjustment, the method further comprises: determining the rotating speed difference value between the first feed water pump and the second feed water pump; and modifying the piecewise function relationship according to the rotating speed difference value.

[0016] According to one embodiment of the present application, the first feed water pump is driven by a first motor through the hydraulic coupler, the hydraulic coupler comprises a pump wheel, a turbine, a spoon tube and a first speed-up gear, the input end of the first speed-up gear is connected with the output shaft of the first motor, the output end of the first speed-up gear is connected with the pump wheel, the turbine is connected with the output shaft of the hydraulic coupler, the output shaft of the hydraulic coupler is connected with the first feed water pump, the inner cavity of the pump wheel and the inner cavity of the turbine together constitute the working cavity of the hydraulic coupler, wherein, when the spoon tube opening degree of the hydraulic coupler is controlled according to the spoon tube opening degree instruction, the oil amount in the working cavity is adjusted through the spoon tube to adjust the rotating speed of the first feed water pump.

[0017] According to one embodiment of the present invention, the variable frequency motor includes a frequency converter and a second motor, the second motor being configured to drive the second water supply pump to operate, wherein, when controlling the operating frequency of the variable frequency motor according to the frequency conversion command, the operating speed of the second motor is adjusted to adjust the speed of the second water supply pump.

[0018] To achieve the above objectives, the water supply device proposed in the second aspect of the present invention includes a memory, a processor, and a mixed speed control program for the water supply device stored in the memory and executable on the processor. When the processor executes the mixed speed control program for the water supply device, it implements the mixed speed control method for the water supply device as described in the first aspect of the present invention.

[0019] According to the water supply equipment proposed in this embodiment of the invention, by executing the mixed speed control program of the water supply equipment, the speed of the first water supply pump can be adjusted by configuring the opening of the scoop tube of the hydraulic coupler, and the speed of the second water supply pump can be adjusted by configuring the operating frequency of the variable frequency motor. The water pumped by the first and second water supply pumps is heated by a high-pressure heater, and the hot water output from the high-pressure heater is convection-driven by a boiler to output superheated steam. Furthermore, the boiler drum water level is acquired, and a target speed is determined based on the drum water level. Based on the target speed, scoop tube opening commands and variable frequency commands are determined. The scoop tube opening command controls the scoop tube opening of the hydraulic coupler, and the variable frequency command controls the operating frequency of the variable frequency motor, so that the speeds of the first and second water supply pumps are synchronously adjusted, ensuring that the drum water level is within a preset range. This ensures the reliable operation of the water supply equipment.

[0020] To achieve the above objectives, a computer-readable storage medium is provided in a third aspect embodiment of the present invention, which stores a mixed speed control program for a water supply device. When the mixed speed control program for the water supply device is executed by a processor, it implements the mixed speed control method for the water supply device as described in the first aspect embodiment of the present invention.

[0021] According to the computer-readable storage medium provided in the embodiments of the present invention, by executing the mixed speed control program for water supply equipment stored thereon, the speed of the first water supply pump can be adjusted by configuring the opening of the scoop tube of the hydraulic coupler, and the speed of the second water supply pump can be adjusted by configuring the operating frequency of the variable frequency motor. The water pumped by the first and second water supply pumps is heated by a high-pressure heater, and the hot water output from the high-pressure heater is convection-generated by a boiler to output superheated steam. Furthermore, the boiler drum water level is acquired, and a target speed is determined based on the drum water level. Based on the target speed, scoop tube opening commands and variable frequency commands are determined. The scoop tube opening command controls the opening of the hydraulic coupler, and the variable frequency command controls the operating frequency of the variable frequency motor, so that the speeds of the first and second water supply pumps are synchronously adjusted, keeping the drum water level within a preset range. This ensures the reliable operation of the water supply equipment.

[0022] To achieve the above objectives, a fourth aspect of the present invention provides a mixed speed control device for a water supply system. The water supply system includes a boiler, a high-pressure heater, and a first water supply device and at least one second water supply device connected in parallel. The first water supply device includes a first water supply pump and a hydraulic coupler connected to the first water supply pump. The second water supply device includes a second water supply pump and a variable frequency motor connected to the second water supply pump. The mixed speed control device includes: an acquisition module for acquiring the boiler drum water level; and a control module for adjusting the speed of the first water supply pump by configuring the opening of the scoop tube of the hydraulic coupler, and for adjusting the speed of the variable frequency motor by configuring the opening of the scoop tube of the hydraulic coupler. The operating frequency is adjusted to regulate the speed of the second feedwater pump; the control module is also used to heat the water pumped by the first and second feedwater pumps through the high-pressure heater, and to convect the hot water output by the high-pressure heater through the boiler to output superheated steam; the control module is also used to determine the target speed according to the steam drum water level, and to determine the scoop tube opening command and frequency conversion command according to the target speed, and to control the scoop tube opening of the hydraulic coupler according to the scoop tube opening command, and to control the operating frequency of the variable frequency motor according to the frequency conversion command, so that the speed of the first feedwater pump and the speed of the second feedwater pump are kept synchronized, so that the steam drum water level is within a preset water level range.

[0023] According to an embodiment of the present invention, a mixed speed control device for a water supply system adjusts the speed of a first water supply pump by configuring the opening of the scoop tube of a hydraulic coupler, and adjusts the speed of a second water supply pump by configuring the operating frequency of a variable frequency motor. A high-pressure heater heats the water pumped by the first and second water supply pumps, and a boiler convects the hot water output from the high-pressure heater to produce superheated steam. The device also acquires the boiler drum water level using an acquisition module. Based on the boiler drum water level, the control module determines a target speed, and based on the target speed, determines a scoop tube opening command and a variable frequency command. The scoop tube opening command controls the opening of the hydraulic coupler, and the variable frequency command controls the operating frequency of the variable frequency motor, ensuring that the speeds of the first and second water supply pumps are synchronized and that the boiler drum water level remains within a preset range. This ensures reliable operation of the water supply system.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a water supply device according to a specific embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a water supply device according to another specific embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of a first water supply device according to a specific embodiment of the present invention;

[0028] Figure 4 yes Figure 3 A magnified view of a portion of the hydraulic coupling O.

[0029] Figure 5 This is a schematic diagram of the structure of a second water supply device according to a specific embodiment of the present invention;

[0030] Figure 6 This is a flowchart illustrating the mixing speed control block of a water supply device according to an embodiment of the present invention.

[0031] Figure 7 This is a flowchart illustrating the mixing speed control block of a water supply device according to an embodiment of the present invention.

[0032] Figure 8 This is a flowchart illustrating the mixing speed control block of a water supply device according to another embodiment of the present invention;

[0033] Figure 9This is a flowchart illustrating the mixing speed control block of a water supply device according to another embodiment of the present invention.

[0034] Figure 10 This is a flowchart illustrating the mixing speed control block of a water supply device according to another embodiment of the present invention.

[0035] Figure 11 This is a block diagram of a mixing speed control device for a water supply system according to an embodiment of the present invention. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] The following description, with reference to the accompanying drawings, outlines an embodiment of the present invention: a method for controlling the mixed speed of a water supply device, a water supply device, a computer-readable storage medium, and a device for controlling the mixed speed of a water supply device.

[0038] Before introducing the mixing speed control method for water supply equipment, the water supply equipment, the computer-readable storage medium, and the mixing speed control device for water supply equipment according to embodiments of the present invention, let's first refer to the appendix. Figures 1-5 The specific structure of the water supply equipment according to an embodiment of the present invention will be described.

[0039] like Figures 1-3 and Figure 5 As shown, the water supply equipment includes a boiler 1, a high-pressure heater 2, and a first water supply device 3 and at least one second water supply device 4 connected in parallel. The first water supply device 3 includes a first water supply pump 31 and a hydraulic coupler 32, which is connected to the first water supply pump 31. The second water supply device 4 includes a second water supply pump 41 and a variable frequency motor 42, which is connected to the second water supply pump 41.

[0040] Furthermore, in some embodiments of the present invention, such as Figure 3 and Figure 4As shown, the first water pump 31 is driven by the first motor 311 through the hydraulic coupling 32. The hydraulic coupling 32 includes a pump wheel 321, a turbine 322, a scoop tube 323, and a first speed-lifting gear 324. The input end of the first speed-lifting gear 324 is connected to the output shaft of the first motor 311, and the output end of the first speed-lifting gear 324 is connected to the pump wheel 321. The turbine 322 is connected to one end of the output shaft of the hydraulic coupling 32, and the other end of the output shaft of the hydraulic coupling 32 is connected to the first water pump 31. The inner cavity of the pump wheel 321 and the inner cavity of the turbine 322 together form the working chamber of the hydraulic coupling 32. When the opening of the scoop tube of the hydraulic coupling 32 is controlled according to the scoop tube opening command, the oil volume in the working chamber is adjusted through the scoop tube to adjust the speed of the first water pump 31.

[0041] In other words, the first motor 311 can transmit its power to the first water pump 31 through the hydraulic coupling 32, thereby driving the first water pump 31 to run and thus driving the first water supply device 3 to supply water.

[0042] Specifically, when the first motor 311 drives the pump wheel 321 to rotate via the first speed-increasing gear 324, the working oil in the inner cavity of the pump wheel 321 gains energy and is sent to the outer circumference of the pump wheel 321 under the action of inertial centrifugal force to form a high-speed oil flow. The high-speed oil flow on the outer circumference of the pump wheel 321 then forms a resultant velocity with the radial relative velocity (the relative velocity between the high-speed oil flow and the center of the pump wheel 321) and the circumferential velocity of the pump wheel 321 outlet. This resultant velocity rushes into the radial flow channel inlet of the turbine 322 and flows along the radial flow channel of the turbine 322 to the inner cavity of the turbine 322. The change in the oil flow torque then drives the turbine 322 to rotate. When the oil flow reaches the outlet of the turbine 322, it forms a resultant velocity with the radial relative velocity and the circumferential velocity of the turbine 322 outlet. This resultant velocity flows into the radial flow channel of the pump wheel 321 and regains energy in the pump wheel 321. Repeat the aforementioned process to form a circulating flow circle of working oil in pump wheel 321 and turbine 322. Thus, pump wheel 321 can convert the mechanical work input by the first electric motor 311 into the kinetic energy of the oil, while turbine 322 can convert the kinetic energy of the oil into the output mechanical work, thereby transmitting the power of the first electric motor 311 to the first water pump 31 through hydraulic coupling 32.

[0043] The scoop tube 323 can adjust the speed of the first water pump 31 by adjusting the amount of oil in the working chamber. For example, when the scoop tube 323 is inserted to the deepest part of the working chamber of the hydraulic coupler 32 (the scoop tube opening is the smallest), the amount of oil in the circulation circle is the smallest, and the speed difference between the pump wheel 321 and the turbine 322 is large. At this time, the output speed of the hydraulic coupler 32 is the lowest. When the scoop tube 323 is inserted to the shallowest part of the working chamber of the hydraulic coupler 32 (the scoop tube opening is the largest), the amount of oil in the circulation circle is the largest, and the speed difference between the pump wheel 321 and the turbine 322 is small. At this time, the output speed of the hydraulic coupler 32 is the largest.

[0044] Furthermore, in some embodiments of the present invention, such as Figure 5 As shown, the variable frequency motor 42 includes a frequency converter 421 and a second motor 422. The second motor 422 is configured to drive the second water supply pump 41 to operate. When the operating frequency of the variable frequency motor 42 is controlled according to the frequency conversion command, the operating speed of the second motor 422 is adjusted to regulate the speed of the second water supply pump 41.

[0045] Specifically, in some embodiments of the present invention, a frequency conversion command can be determined based on the target speed, and the frequency converter 421 can be controlled to adjust the operating speed of the second motor 422 according to the frequency conversion command, so as to adjust the speed of the second water pump 41 through the second motor 422. That is to say, the second motor 422 can transmit power corresponding to the operating speed to the second water pump 41 to adjust the speed of the second water pump 41.

[0046] The frequency converter 421 can adjust the speed of the second water supply pump 41 by adjusting the operating speed of the second motor 422. For example, when the frequency converter 421 increases the operating speed of the second motor 422 according to the frequency conversion command, the power transmitted from the second motor 422 to the second water supply pump 41 increases, thereby increasing the speed of the second water supply pump 41. When the frequency converter 421 decreases the operating speed of the second motor 422 according to the frequency conversion command, the power transmitted from the second motor 422 to the second water supply pump 41 decreases, thereby decreasing the speed of the second water supply pump 41.

[0047] Furthermore, other components and functions of the water supply equipment in the embodiments of the present invention are known to those skilled in the art, and will not be described in detail here to reduce redundancy.

[0048] Figure 6 This is a flowchart illustrating the mixing speed control block of a water supply device according to an embodiment of the present invention.

[0049] like Figure 6 As shown, in some embodiments of the present invention, the mixing speed control method for a water supply device includes:

[0050] S101, the speed of the first water pump is adjusted by configuring the opening of the scoop tube of the hydraulic coupling, and the speed of the second water pump is adjusted by configuring the operating frequency of the variable frequency motor.

[0051] It is understood that, in the embodiments of the present invention, the speed of the first water pump can be adjusted by configuring the opening of the scoop tube of the hydraulic coupler, and the speed of the second water pump can be adjusted by configuring the operating frequency of the variable frequency motor, so that the speed of the first water pump and the speed of the second water pump are kept in sync.

[0052] S102 heats the water pumped by the first and second feed water pumps through a high-pressure heater, and outputs superheated steam by convection of the hot water output from the high-pressure heater through a boiler.

[0053] Understandably, the water pumped by the first and second feedwater pumps can be heated by a high-pressure heater, and the hot water output from the high-pressure heater can be convected by a boiler to output superheated steam, thereby ensuring the stable operation of the generator set and the stable power generation of the power plant.

[0054] S103, obtain the boiler drum water level.

[0055] Optionally, in some embodiments of the present invention, such as Figure 1 As shown, a steam drum water level detector A can be installed at the steam drum water level of the boiler to obtain the real-time steam drum water level of the boiler.

[0056] S104 determines the target speed based on the steam drum water level, and determines the scoop tube opening command and frequency conversion command based on the target speed. It also controls the scoop tube opening of the hydraulic coupling based on the scoop tube opening command and controls the operating frequency of the variable frequency motor based on the frequency conversion command, so that the speed of the first feed water pump and the speed of the second feed water pump are synchronized and the steam drum water level is within the preset water level range.

[0057] Because the speed regulation range of the scoop tube opening is 30%–80%, meaning that the output speed of the hydraulic coupler does not change significantly when the scoop tube opening is between 0% and 30%, but is fully open when the scoop tube opening is above 80%, the speed regulation accuracy, response, and sensitivity are low when adjusting the scoop tube opening. This is especially problematic under heavy and light loads, where the feed pump speed may differ at the same scoop tube opening. In contrast, speed regulation by adjusting the operating frequency is not only adjustable but also has high linearity and sensitivity. Furthermore, when the first and second feed water devices... Simultaneous operation, with varying speed regulation accuracy, speed regulation response, and speed regulation sensitivity, can cause significant interference to the automatic feedwater control, resulting in large fluctuations in the steam drum water level and posing a significant threat to the normal operation of the power plant and the safety of the unit. Therefore, in the embodiments of this invention, the scoop tube opening command and frequency conversion command are determined based on the target speed. The scoop tube opening command is used to control the scoop tube opening of the hydraulic coupling, and the frequency conversion command is used to control the operating frequency of the variable frequency motor, so that the speed of the first feedwater pump and the speed of the second feedwater pump are kept synchronized, ensuring that the steam drum water level is within the preset water level range.

[0058] It should be understood that in the embodiments of the present invention described above, the target rotational speed can be determined based on the boiler drum water level, and the scoop tube opening command and frequency conversion command can be determined based on the target rotational speed. The scoop tube opening command and frequency conversion command are both individually controllable and adjustable commands, respectively acting on the scoop tube opening control and operating frequency control. By adjusting the command response speed and accuracy of configuring the scoop tube opening and operating frequency, the rotational speeds of the first and second feedwater pumps are synchronized, ensuring that the boiler drum water level is within a preset range. This ensures the reliable operation of the feedwater equipment and the stable operation of the generator set.

[0059] Furthermore, in some embodiments of the present invention, such as Figure 7 As shown, determining the target rotational speed based on the water level in the steam drum includes:

[0060] S201, obtain the set steam drum water level of the boiler, and determine the water level difference between the set steam drum water level and the steam drum water level.

[0061] Optionally, in some embodiments of the present invention, setting the steam drum water level may include a maximum steam drum water level and a minimum steam drum water level, and the steam drum water level of the boiler is the real-time steam drum water level detected by the steam drum water level detector A.

[0062] S202, determine the target rotational speed based on the water level difference.

[0063] In other words, in some embodiments of the present invention, the set steam drum water level of the boiler can be obtained, and the water level difference between the set steam drum water level and the steam drum water level can be determined. Then, the target speed can be determined based on the water level difference, thereby realizing single-impulse (steam drum water level) water level control.

[0064] It should be understood that, in the embodiments of the present invention described above, after determining the target rotational speed based on the water level difference between the set steam drum water level and the target rotational speed, the scoop tube opening command and the frequency conversion command can be determined based on the target rotational speed. The scoop tube opening command is used to control the scoop tube opening of the hydraulic coupling, and the frequency conversion command is used to control the operating frequency of the variable frequency motor. This ensures that the rotational speeds of the first and second feedwater pumps are synchronously adjusted, keeping the steam drum water level within the preset water level range. This ensures the reliable operation of the water supply equipment and the stable operation of the generator set.

[0065] Furthermore, in some embodiments of the present invention, such as Figure 8 As shown, determining the target rotational speed based on the water level in the steam drum includes:

[0066] S301, obtain the steam flow rate of superheated steam, obtain the hot water flow rate output by the high-pressure heater, and determine the flow rate difference based on the steam flow rate and the hot water flow rate.

[0067] S302, determine the target flow rate based on the water level in the steam drum, and determine the target rotational speed based on the target flow rate and the flow rate difference.

[0068] Optionally, in some embodiments of the present invention, such as Figure 2 As shown, a steam flow detector B can be installed in the superheated steam channel to obtain the steam flow rate of the hot steam. A flow detector C can be installed at the outlet of the high-pressure heater to obtain the hot water flow rate output by the high-pressure heater. A steam drum water level detector A can be installed at the boiler's steam drum water level to obtain the boiler's steam drum water level. The flow difference is determined based on the steam flow rate and the hot water flow rate. Then, the target flow rate is determined based on the steam drum water level, and the target speed is determined based on the target flow rate and the flow difference, thereby realizing three-impulse (steam drum water level, steam flow rate, and feedwater flow rate) water level control.

[0069] It should be understood that, in the embodiments of the present invention described above, after determining the target rotational speed based on the target flow rate (determined by the steam drum water level) and the flow difference (determined by the steam flow rate and the hot water flow rate), the scoop tube opening command and the frequency conversion command can be determined based on the target rotational speed. The scoop tube opening command is used to control the scoop tube opening of the hydraulic coupling, and the frequency conversion command is used to control the operating frequency of the variable frequency motor. This ensures that the rotational speeds of the first and second feedwater pumps are synchronized, keeping the steam drum water level within a preset range. This ensures the reliable operation of the water supply equipment and the stable operation of the generator set.

[0070] Furthermore, in some embodiments of the present invention, such as Figure 9 As shown, the scoop tube opening command and frequency conversion command are determined based on the target rotational speed, including:

[0071] S401, Obtain historical operating data of the first water supply device and the second water supply device.

[0072] In other words, in some embodiments of the present invention, during the water supply operation of the first water supply device and the second water supply device, the historical operating data of the first water supply device and the second water supply device can be recorded and stored to facilitate the acquisition of the historical operating data of the first water supply device and the second water supply device.

[0073] Optionally, the historical operating data of the first water supply device may include the opening degree of the scoop tube corresponding to the scoop tube opening command and the speed of the first water supply pump, and the historical operating data of the second water supply device may include the operating frequency corresponding to the frequency conversion command and the speed of the second water supply pump.

[0074] S402, analyze and process the historical operating data of the first water supply device and the historical operating data of the second water supply device to determine the matching relationship between the opening degree of the scoop tube and the operating frequency and the speed of the water supply pump.

[0075] Specifically, after obtaining the historical operating data of the first water supply device and the second water supply device, the corresponding water pump speed can be determined first based on the opening of the scoop tube. Then, using the water pump speed as an intermediate value, the corresponding operating frequency can be determined based on the water pump speed. Thus, the matching relationship between the scoop tube opening and the operating frequency and the water supply pump speed can be determined. In a specific embodiment of the present invention, the matching relationship can be as shown in Table 1 below. The matching relationship can be used to indicate the scoop tube opening command and frequency conversion command corresponding to the target speed.

[0076] Table 1

[0077]

[0078] For example, the historical operating data of the first water supply device can be analyzed and processed to obtain the pump speed a1 corresponding to the opening degree a1. Then, the historical operating data of the second water supply device can be analyzed and processed, and the pump speed a1 can be used as an intermediate value to determine the corresponding operating frequency a1. Thus, it can be determined that the speed a1 matches the frequency a1 and the opening degree a1. Similarly, different frequency conversion commands and scoop tube opening commands can be determined according to different speeds. For example, the speed a2 matches the frequency a2 and the opening degree a2, the speed a3 matches the frequency a3 and the opening degree a3, and so on, and the speed an matches the frequency an and the opening degree an. Thus, stepless speed regulation of the first and second water supply devices can be achieved.

[0079] S403 determines the scoop tube opening command and frequency conversion command based on the target speed and matching relationship.

[0080] It should be understood that, in the embodiments of the present invention described above, after determining the target speed based on the steam drum water level, the scoop tube opening command and frequency conversion command can be determined based on the target speed and the matching relationship. The scoop tube opening command is used to control the hydraulic coupling's scoop tube opening, and the frequency conversion command is used to control the operating frequency of the variable frequency motor. This ensures that the speeds of the first and second feedwater pumps are synchronously adjusted, keeping the steam drum water level within a preset range. This ensures the reliable operation of the feedwater equipment and the stable operation of the generator set.

[0081] Furthermore, in some embodiments of the present invention, such as Figure 10 As shown, the scoop tube opening command and frequency conversion command are determined based on the target rotational speed, including:

[0082] S501, obtain the piecewise linear function relationship between the opening degree of the spoon tube and the operating frequency.

[0083] Since the historical operating data of the first water supply device and the historical operating data of the second water supply device will increase over time, and the data storage space is limited, in the embodiments of the present invention, the piecewise linear function relationship between the scoop tube opening degree and the operating frequency can be obtained. In the case of limited data storage space, the scoop tube opening degree command and the frequency conversion command can be determined according to the target speed and the piecewise linear function relationship between the scoop tube opening degree and the operating frequency, thereby saving storage space costs.

[0084] Specifically, under the condition that the pipeline resistance of the first water supply device and the second water supply device is the same, the output tests of the first water supply pump and the second water supply pump are carried out respectively. For example, during the process from the minimum output of the water supply pump to the maximum output of the water supply pump, the speed (corresponding to the operating frequency) and pressure of the second water supply pump are used as the benchmark, and the opening degree of the scoop tube of the first water supply pump at the same speed and pressure is recorded. Then, the piecewise linear function relationship between the opening degree of the scoop tube of the first water supply pump and the operating frequency of the second water supply pump is analyzed and obtained.

[0085] It is understandable that the broken line function relationship between the opening of the scoop tube of the first water pump and the operating frequency of the second water pump refers to the corresponding relationship between the opening of the scoop tube of the first water pump and the operating frequency of the second water pump under the same water pump speed and water pump pressure.

[0086] S502 determines one of the spoon tube opening command and the frequency conversion command based on the target speed, and converts one of the spoon tube opening command and the frequency conversion command according to the piecewise linear function relationship to obtain the other of the spoon tube opening command and the frequency conversion command.

[0087] Specifically, in some embodiments of the present invention, during the mixed speed regulation process of the first water supply device and the second water supply device, one of the spoon tube opening command and the frequency conversion command can be determined first according to the target speed. Then, one of the spoon tube opening command and the frequency conversion command can be converted according to the broken line function relationship to obtain the other of the spoon tube opening command and the frequency conversion command. In this way, the output of the first water supply pump controlled by the first water supply device according to the spoon tube opening command is consistent with the output of the second water supply pump controlled by the second water supply device according to the frequency conversion command, so that the speed of the first water supply pump and the speed of the second water supply pump are kept synchronized.

[0088] It should be understood that, in the embodiments of the present invention described above, after determining the target speed based on the steam drum water level, one of the scoop tube opening command and the frequency conversion command can be determined based on the target speed. Then, one of the scoop tube opening command and the frequency conversion command is converted using a piecewise linear function relationship to obtain the other of the scoop tube opening command and the frequency conversion command. The scoop tube opening of the hydraulic coupling is controlled according to the scoop tube opening command, and the operating frequency of the variable frequency motor is controlled according to the frequency conversion command, so that the speed of the first feedwater pump and the speed of the second feedwater pump are synchronously adjusted, ensuring that the steam drum water level is within a preset water level range. This ensures the reliable operation of the feedwater equipment and the stable operation of the generator set.

[0089] Furthermore, in some embodiments of the present invention, after the rotational speed of the first water pump and the rotational speed of the second water pump are kept synchronized, the method further includes: determining the rotational speed difference between the first water pump and the second water pump, and correcting the piecewise linear function relationship based on the rotational speed difference.

[0090] Specifically, after the rotational speeds of the first and second water pumps are synchronized, in order to further improve the synchronization accuracy, in some embodiments of the present invention, if there is a speed difference between the first and second water pumps, the piecewise linear function relationship can be corrected based on the speed difference, thereby improving the accuracy of the piecewise linear function relationship and improving the synchronization accuracy of the rotational speeds of the first and second water pumps. For example, if it is determined that the rotational speed of the first water pump is too high or too low based on the speed difference between the first and second water pumps, the opening of the scoop tube in the piecewise linear function relationship can be corrected. And, if it is determined that the rotational speed of the second water pump is too high or too low based on the speed difference between the first and second water pumps, the operating frequency in the piecewise linear function relationship can be corrected.

[0091] It should be understood that in the embodiments of the present invention described above, after determining the target speed based on the steam drum water level, and further determining one of the scoop tube opening command and the frequency conversion command based on the target speed, and converting one of the scoop tube opening command and the frequency conversion command according to the piecewise linear function relationship to obtain the other of the scoop tube opening command and the frequency conversion command, and after controlling the scoop tube opening of the hydraulic coupling according to the scoop tube opening command and controlling the operating frequency of the variable frequency motor according to the frequency conversion command, the speed difference between the first feedwater pump and the second feedwater pump can also be determined, and the piecewise linear function relationship can be corrected according to the speed difference, thereby improving the synchronization adjustment accuracy of the speed of the first feedwater pump and the speed of the second feedwater pump, so that the steam drum water level is within the preset water level range. This ensures the reliable operation of the water supply equipment and the stable operation of the generator set.

[0092] In summary, the mixed speed control method for water supply equipment proposed in this embodiment of the invention adjusts the speed of the first water supply pump by configuring the opening degree of the scoop tube of the hydraulic coupler, and adjusts the speed of the second water supply pump by configuring the operating frequency of the variable frequency motor. The water pumped by the first and second water supply pumps is heated by a high-pressure heater, and the hot water output from the high-pressure heater is convected by a boiler to output superheated steam. The boiler drum water level is obtained, and a target speed is determined based on the drum water level. A scoop tube opening command and a variable frequency command are determined based on the target speed. The scoop tube opening degree of the hydraulic coupler is controlled according to the scoop tube opening command, and the operating frequency of the variable frequency motor is controlled according to the variable frequency command, so that the speeds of the first and second water supply pumps are synchronously adjusted, ensuring that the drum water level is within a preset range.

[0093] Based on the mixed speed control method for water supply equipment in the foregoing embodiments of the present invention, the present invention also proposes a water supply equipment, including a memory, a processor, and a mixed speed control program for the water supply equipment stored in the memory and executable on the processor. When the processor executes the mixed speed control program for the water supply equipment, it implements the mixed speed control method for the water supply equipment as described in the foregoing embodiments of the present invention.

[0094] It should be noted that when the water supply equipment in the embodiments of the present invention runs the mixed speed regulation control program of the water supply equipment, it can realize the specific implementation method that corresponds one-to-one with the mixed speed regulation control method of the water supply equipment in the aforementioned embodiments of the present invention. In order to reduce redundancy, it will not be described again here.

[0095] In summary, the water supply equipment proposed in this embodiment of the invention, by executing the mixed speed control program of the water supply equipment, can adjust the speed of the first water supply pump by configuring the opening of the scoop tube of the hydraulic coupler, and adjust the speed of the second water supply pump by configuring the operating frequency of the variable frequency motor. The water pumped by the first and second water supply pumps is heated by a high-pressure heater, and the hot water output from the high-pressure heater is convection-driven by a boiler to output superheated steam. Furthermore, the boiler drum water level is acquired, and a target speed is determined based on the drum water level. Based on the target speed, scoop tube opening commands and variable frequency commands are determined. The scoop tube opening command controls the opening of the hydraulic coupler, and the variable frequency command controls the operating frequency of the variable frequency motor, so that the speeds of the first and second water supply pumps are synchronously adjusted, ensuring that the drum water level is within a preset range. This ensures the reliable operation of the water supply equipment.

[0096] Based on the mixed speed control method for water supply equipment in the foregoing embodiments of the present invention, the present invention also proposes a computer-readable storage medium storing a mixed speed control program for water supply equipment. When the mixed speed control program for water supply equipment is executed by a processor, it implements the mixed speed control method for water supply equipment as described in the foregoing embodiments of the present invention.

[0097] It should be noted that when the computer-readable storage medium of the present invention runs the mixing speed control program of the water supply equipment, it can implement specific implementation methods that correspond one-to-one with the mixing speed control method of the water supply equipment described in the foregoing embodiments of the present invention. To reduce redundancy, these will not be repeated here.

[0098] In summary, according to the computer-readable storage medium proposed in the embodiments of the present invention, by executing the mixed speed control program for the water supply equipment stored thereon, the speed of the first water supply pump can be adjusted by configuring the opening of the scoop tube of the hydraulic coupler, and the speed of the second water supply pump can be adjusted by configuring the operating frequency of the variable frequency motor. The water pumped by the first and second water supply pumps is heated by a high-pressure heater, and the hot water output from the high-pressure heater is convection-driven by a boiler to output superheated steam. Furthermore, the boiler drum water level is acquired, and a target speed is determined based on the drum water level. A scoop tube opening command and a variable frequency command are then determined based on the target speed. The scoop tube opening command controls the opening of the hydraulic coupler, and the variable frequency command controls the operating frequency of the variable frequency motor, so that the speeds of the first and second water supply pumps are synchronously adjusted, ensuring that the drum water level is within a preset range. This ensures the reliable operation of the water supply equipment.

[0099] Based on the aforementioned method for mixing speed control of water supply equipment according to embodiments of the present invention, embodiments of the present invention also propose a mixing speed control device for water supply equipment, such as... Figure 11 As shown, the mixing speed control device 200 for water supply equipment includes: an acquisition module 10 and a control module 20.

[0100] The acquisition module 10 is used to acquire the boiler drum water level; the control module 20 is used to adjust the speed of the first feedwater pump by configuring the opening of the scoop tube of the hydraulic coupler, and to adjust the speed of the second feedwater pump by configuring the operating frequency of the variable frequency motor; the control module 20 is also used to heat the water pumped by the first and second feedwater pumps through the high-pressure heater, and to convect the hot water output by the high-pressure heater through the boiler to output superheated steam; the control module 20 is also used to determine the target speed according to the boiler drum water level, and to determine the scoop tube opening command and the variable frequency command according to the target speed, and to control the scoop tube opening of the hydraulic coupler according to the scoop tube opening command, and to control the operating frequency of the variable frequency motor according to the variable frequency command, so that the speed of the first and second feedwater pumps are synchronized and the boiler drum water level is within the preset water level range.

[0101] Optionally, the acquisition module 10 can be a steam drum water level detector installed at the steam drum water level of the boiler to acquire the steam drum water level of the boiler. The control module 20 can determine the target speed based on the steam drum water level, and then determine the scoop tube opening command and frequency conversion command based on the target speed. It can also control the scoop tube opening of the hydraulic coupling based on the scoop tube opening command and control the operating frequency of the variable frequency motor based on the frequency conversion command. The control module 20 can convert the scoop tube opening command and the frequency conversion command into control commands with a unified range, so that the speed of the first feedwater pump and the speed regulation response speed, speed regulation accuracy and speed regulation linearity of the second feedwater pump are consistent, so that the speed of the first feedwater pump and the speed of the second feedwater pump are kept in sync and the steam drum water level is within the preset water level range.

[0102] Furthermore, in some embodiments of the present invention, the control module 20 is also used to obtain the set steam drum water level of the boiler and determine the water level difference between the set steam drum water level and the steam drum water level; and determine the target rotational speed based on the water level difference.

[0103] Furthermore, in some embodiments of the present invention, the control module 20 is also configured to: acquire the steam flow rate of superheated steam, acquire the hot water flow rate output by the high-pressure heater, and determine the flow rate difference based on the steam flow rate and the hot water flow rate; determine the target flow rate based on the steam drum water level, and determine the target rotational speed based on the target flow rate and the flow rate difference.

[0104] Furthermore, in some embodiments of the present invention, the control module 20 is also used to acquire historical operating data of the first water supply device and the second water supply device; analyze and process the historical operating data of the first water supply device and the second water supply device to determine the matching relationship between the scoop tube opening degree and operating frequency and the water supply pump speed; and determine the scoop tube opening degree command and frequency conversion command according to the target speed and the matching relationship.

[0105] Furthermore, in some embodiments of the present invention, the control module 20 is also used to obtain the piecewise linear function relationship between the opening degree of the scoop tube and the operating frequency; determine one of the scoop tube opening command and the frequency conversion command according to the target rotation speed; and convert one of the scoop tube opening command and the frequency conversion command according to the piecewise linear function relationship to obtain the other of the scoop tube opening command and the frequency conversion command.

[0106] Furthermore, in some embodiments of the present invention, the control module 20 is also used to determine the speed difference between the first water pump and the second water pump; and to correct the piecewise linear function relationship based on the speed difference.

[0107] Furthermore, in some embodiments of the present invention, the first water pump is driven by a first electric motor through a hydraulic coupler. The hydraulic coupler includes a pump impeller, a turbine, a scoop tube, and a first speed-lifting gear. The input end of the first speed-lifting gear is connected to the output shaft of the first electric motor, and the output end of the first speed-lifting gear is connected to the pump impeller. The turbine is connected to the output shaft of the hydraulic coupler, and the output shaft of the hydraulic coupler is connected to the first water pump. The inner cavity of the pump impeller and the inner cavity of the turbine together form the working chamber of the hydraulic coupler. When controlling the opening of the scoop tube of the hydraulic coupler according to the scoop tube opening command, the oil volume in the working chamber is adjusted through the scoop tube to adjust the speed of the first water pump.

[0108] Furthermore, in some embodiments of the present invention, the variable frequency motor includes a frequency converter and a second motor, the second motor being configured to drive a second water supply pump, wherein, when controlling the operating frequency of the variable frequency motor according to the frequency conversion command, the operating speed of the second motor is adjusted to regulate the speed of the second water supply pump.

[0109] It should be noted that the specific implementation of the mixing speed control device 200 of the water supply equipment in this embodiment of the invention corresponds one-to-one with the specific implementation of the mixing speed control method of the water supply equipment in the aforementioned embodiment of the invention. To reduce redundancy, it will not be described again here.

[0110] In summary, the mixed speed control device for water supply equipment proposed in this embodiment of the invention regulates the speed of the first water supply pump by configuring the opening of the scoop tube of the hydraulic coupler through a control module, and regulates the speed of the second water supply pump by configuring the operating frequency of the variable frequency motor. A high-pressure heater heats the water pumped by the first and second water supply pumps, and a boiler convects the hot water output from the high-pressure heater to output superheated steam. Furthermore, an acquisition module acquires the boiler drum water level. The control module then determines the target speed based on the drum water level, and determines the scoop tube opening command and the variable frequency command based on the target speed. The scoop tube opening command controls the opening of the hydraulic coupler, and the variable frequency command controls the operating frequency of the variable frequency motor, ensuring that the speeds of the first and second water supply pumps are synchronously adjusted, keeping the drum water level within a preset range. This ensures the reliable operation of the water supply equipment.

[0111] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0112] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0113] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for mixing speed control of a water supply equipment, characterized in that, The water supply equipment includes a boiler, a high-pressure heater, and a first water supply device and at least one second water supply device connected in parallel. The first water supply device includes a first water supply pump and a hydraulic coupler, the hydraulic coupler being connected to the first water supply pump. The second water supply device includes a second water supply pump and a variable frequency motor, the variable frequency motor being connected to the second water supply pump. The method includes: The speed of the first water pump is adjusted by configuring the opening of the scoop tube of the hydraulic coupler, and the speed of the second water pump is adjusted by configuring the operating frequency of the variable frequency motor. The high-pressure heater heats the water pumped by the first and second feed water pumps, and the boiler convects the hot water output from the high-pressure heater to output superheated steam. Obtain the steam drum water level of the boiler; The target speed is determined based on the steam drum water level, and the scoop tube opening command and frequency conversion command are determined based on the target speed. The scoop tube opening command is used to control the scoop tube opening of the hydraulic coupler, and the frequency conversion command is used to control the operating frequency of the variable frequency motor, so that the speed of the first feed water pump and the speed of the second feed water pump are kept synchronized and adjusted so that the steam drum water level is within the preset water level range. The process of determining the scoop tube opening command and frequency conversion command based on the target rotational speed includes: acquiring historical operating data of the first water supply device and the second water supply device; analyzing and processing the historical operating data of the first water supply device and the second water supply device to determine the matching relationship between the scoop tube opening and the operating frequency and the water supply pump rotational speed; and determining the scoop tube opening command and the frequency conversion command based on the target rotational speed and the matching relationship. Determining the scoop tube opening command and the frequency conversion command based on the target rotational speed includes: obtaining the piecewise linear function relationship between the scoop tube opening and the operating frequency; determining one of the scoop tube opening command and the frequency conversion command based on the target rotational speed; and converting one of the scoop tube opening command and the frequency conversion command based on the piecewise linear function relationship to obtain the other of the scoop tube opening command and the frequency conversion command.

2. The method according to claim 1, characterized in that, Determining the target rotational speed based on the steam drum water level includes: Obtain the set steam drum water level of the boiler, and determine the water level difference between the set steam drum water level and the steam drum water level; The target rotational speed is determined based on the water level difference.

3. The method according to claim 1, characterized in that, Determining the target rotational speed based on the steam drum water level includes: The steam flow rate of the superheated steam is obtained, and the hot water flow rate output by the high-pressure heater is obtained, and the flow rate difference is determined based on the steam flow rate and the hot water flow rate; The target flow rate is determined based on the water level in the steam drum, and the target rotational speed is determined based on the target flow rate and the difference between the flow rates.

4. The method according to claim 1, characterized in that, After the rotational speeds of the first and second water pumps are synchronized, the method further includes: Determine the speed difference between the first water supply pump and the second water supply pump; The piecewise linear function relationship is corrected based on the speed difference.

5. The method according to any one of claims 1-3, characterized in that, The first water pump is driven by a first electric motor through the hydraulic coupler. The hydraulic coupler includes a pump impeller, a turbine, a scoop tube, and a first speed-lifting gear. The input end of the first speed-lifting gear is connected to the output shaft of the first electric motor, and the output end of the first speed-lifting gear is connected to the pump impeller. The turbine is connected to the output shaft of the hydraulic coupler, and the output shaft of the hydraulic coupler is connected to the first water pump. The inner cavity of the pump impeller and the inner cavity of the turbine together form the working chamber of the hydraulic coupler. When the opening of the scoop tube of the hydraulic coupler is controlled according to the scoop tube opening command, the oil volume in the working chamber is adjusted through the scoop tube to adjust the speed of the first water pump.

6. The method according to claim 5, characterized in that, The variable frequency motor includes a frequency converter and a second motor. The second motor is configured to drive the second water supply pump. When the operating frequency of the variable frequency motor is controlled according to the frequency conversion command, the operating speed of the second motor is adjusted to regulate the speed of the second water supply pump.

7. A water supply device, characterized in that, The device includes a memory, a processor, and a mixed speed control program for a water supply device stored in the memory and executable on the processor. When the processor executes the mixed speed control program for the water supply device, it implements the mixed speed control method for the water supply device according to any one of claims 1-6.

8. A computer-readable storage medium, characterized in that, It stores a mixed speed control program for a water supply device, which, when executed by a processor, implements the mixed speed control method for a water supply device according to any one of claims 1-6.

9. A mixing speed control device for a water supply system, characterized in that, The water supply equipment includes a boiler, a high-pressure heater, and a first water supply device and at least one second water supply device connected in parallel. The first water supply device includes a first water supply pump and a hydraulic coupler, the hydraulic coupler being connected to the first water supply pump. The second water supply device includes a second water supply pump and a variable frequency motor, the variable frequency motor being connected to the second water supply pump. The mixed speed control device includes: The acquisition module is used to acquire the steam drum water level of the boiler; The control module is used to adjust the speed of the first water pump by configuring the opening of the scoop tube of the hydraulic coupler, and to adjust the speed of the second water pump by configuring the operating frequency of the variable frequency motor. The control module is also used to heat the water pumped by the first feed water pump and the second feed water pump through the high-pressure heater, and to convect the hot water output by the high-pressure heater through the boiler to output superheated steam. The control module is also used to determine the target speed according to the steam drum water level, and to determine the scoop tube opening command and frequency conversion command according to the target speed, and to control the scoop tube opening of the hydraulic coupler according to the scoop tube opening command, and to control the operating frequency of the frequency conversion motor according to the frequency conversion command, so that the speed of the first feed water pump and the speed of the second feed water pump are kept synchronized and adjusted so that the steam drum water level is within the preset water level range; The process of determining the scoop tube opening command and frequency conversion command based on the target rotational speed includes: acquiring historical operating data of the first water supply device and the second water supply device; analyzing and processing the historical operating data of the first water supply device and the second water supply device to determine the matching relationship between the scoop tube opening and the operating frequency and the water supply pump rotational speed; and determining the scoop tube opening command and the frequency conversion command based on the target rotational speed and the matching relationship. Determining the scoop tube opening command and the frequency conversion command based on the target rotational speed includes: obtaining the piecewise linear function relationship between the scoop tube opening and the operating frequency; determining one of the scoop tube opening command and the frequency conversion command based on the target rotational speed; and converting one of the scoop tube opening command and the frequency conversion command based on the piecewise linear function relationship to obtain the other of the scoop tube opening command and the frequency conversion command.

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