An air compressor control method and device

Abstract

The present application discloses an air compressor control method and device. The method includes: when the air supply system needs to increase the frequency to the target frequency, increasing the frequency of the variable-frequency air compressor. When all the started industrial-frequency air compressors and variable-frequency air compressors are in the full-load state, it is judged whether the frequency of the air supply system reaches the target frequency. If not, starting an industrial-frequency air compressor in the off state until the frequency of the air supply system reaches the target frequency, then reducing the frequency of the variable-frequency air compressor to the balance frequency, making the gas consumption and gas production balanced, and controlling the working frequency of the variable-frequency air compressor within the balance frequency floating range. It can be seen that due to the intervention of the variable-frequency air compressor, adjusting the frequency based on the balance between the gas consumption and gas production enables the upper and lower pressures of the air compressor control system pipeline to be stable, reduces the pressure fluctuation, reduces the power loss caused by the upward pressure fluctuation, thereby reducing the unloaded operation of the industrial-frequency air compressor, saving electric energy and reducing the maintenance amount at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of air compression, and more specifically, to an air compressor control method and device. Background Art

[0002] With the continuous improvement of industrial production requirements, each process in the production process needs to ensure the stable operation of the instruments and systems it uses in order to steadily increase the production volume. In some processes of the production process, air compressors (referred to as air compressors for short) play an indispensable role. Therefore, the stable and continuous operation of air compressors is an important part in the process of steadily increasing industrial production volume.

[0003] Generally, in the control of air compressors, loading and unloading valves are used to control the air supply of air compressors. Due to the differences in the working cycles of gas-using equipment or production processes, the gas consumption fluctuates, sometimes causing the air compressors to load and unload frequently, resulting in a large amount of equipment maintenance and high energy consumption.

[0004] How to stably control the frequency of air compressors to keep the gas consumption fluctuation within a reasonable range and reduce the energy consumption of air compressors is an issue that needs attention. Summary of the Invention

[0005] In view of the above problems, the present application is proposed to provide an air compressor control method and device to reduce the energy consumption of air compressors.

[0006] To achieve the above object, the following specific solutions are proposed:

[0007] An air compressor control method, applied to an air compressor control system, the method includes:

[0008] When the control cabinet of the variable-frequency air compressor in the air compressor control system receives an instruction from a remote terminal to increase the frequency to a preset target frequency, drive the control cabinet to increase the frequency of the variable-frequency air compressor;

[0009] When all the activated line-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in a full-load state, determine whether the frequency of the air supply system reaches the preset target frequency, where the air supply system includes the variable-frequency air compressor and each line-frequency air compressor;

[0010] If not, determine the latest target line-frequency air compressor from each unactivated line-frequency air compressor in the air compressor control system, so that the remote terminal generates an instruction to start the target line-frequency air compressor;

[0011] When the target industrial frequency air compressor receives the start-up instruction from the remote terminal, it drives the target industrial frequency air compressor to start, and returns to execute the step of judging whether the frequency of the air supply system reaches the preset target frequency when all the started industrial frequency air compressors and the variable frequency air compressor in the air compressor control system are in a full-load state;

[0012] If so, drive the control cabinet to reduce the frequency of the variable frequency air compressor until the balance frequency, so as to balance the gas consumption and the gas production of the air compressor control system;

[0013] Taking the balance frequency as the center of the interval, determine the frequency floating interval, so that the control cabinet controls the frequency of the variable frequency air compressor during operation within the frequency floating interval.

[0014] Optionally, the air compressor control system includes a variable frequency air compressor, several industrial frequency air compressors, an intermediate gas storage tank, a cooling module, an adsorption drying module, an instrument gas tank and an industrial gas tank;

[0015] The variable frequency air compressor and each industrial frequency air compressor are connected to the input end of the gas production main pipe;

[0016] The output end of the gas production main pipe is connected to the input end of the cooling module through the intermediate gas storage tank;

[0017] The first output end of the cooling module is connected to the instrument gas tank through the adsorption drying module;

[0018] The second output end of the cooling module is connected to the industrial gas tank;

[0019] The variable frequency air compressor is equipped with a control cabinet, and the control cabinet is used to adjust the frequency of the variable frequency air compressor;

[0020] Thermal flow meters are installed at the exhaust ports of the variable frequency air compressor, the exhaust ports of each industrial frequency air compressor, and the gas production main pipe;

[0021] Intelligent pressure control devices are installed at the outlet of the intermediate gas storage tank, the outlet of the instrument gas tank, and the outlet of the industrial gas tank;

[0022] The control cabinet, each industrial frequency air compressor, the cooling module, and the adsorption drying module are all connected to the remote terminal.

[0023] Optionally, the adsorption drying module includes a blower zero-consumption adsorption dryer or several mutually parallel adsorption dryers, and the processing air volume of the blower zero-consumption adsorption dryer is 65 Nm 3 / h, the percentage of the regeneration gas consumption of the blast zero-consumption air adsorption dryer is not higher than 0.05%, and the pressure dew point temperature range of the blast zero-consumption air adsorption dryer is -40°C to -20°C.

[0024] Optionally, the cooling module includes a rear cooling section or a plurality of refrigerant dryers connected in parallel. The air volume processed by the rear cooling section is 80 Nm 3 / h. The outlet air temperature of the rear cooling section under standard conditions is not higher than 45°C, and the cooling method of the rear cooling section is water-cooled.

[0025] Optionally, the variable-frequency air compressor is a screw air compressor. The variable-frequency method of the screw air compressor is permanent magnet frequency conversion. The rated gas production pressure of the screw air compressor is between 0.6 MPa and 0.7 MPa, and the gas production volume of the screw air compressor is not less than 21 Nm 3 / h. The cooling method of the screw air compressor is water-cooled.

[0026] Optionally, after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, the following steps are further included:

[0027] Determine the first air pressure at the outlet of the intermediate gas storage tank of the air compressor control system;

[0028] Taking the first air pressure as the center of the interval, determine the first air pressure floating interval;

[0029] Drive the intelligent pressure control device of the intermediate gas storage tank to control the air pressure of the intermediate gas storage tank within the first air pressure floating interval.

[0030] Optionally, after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, the following steps are further included:

[0031] Determine the second air pressure at the outlet of the instrument gas storage tank of the air compressor control system;

[0032] Taking the second air pressure as the center of the interval, determine the second air pressure floating interval;

[0033] Drive the intelligent pressure control device of the instrument gas storage tank to control the air pressure of the instrument gas storage tank within the second air pressure floating interval.

[0034] Optionally, after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, the following steps are further included:

[0035] Determine the third air pressure at the outlet of the industrial gas storage tank of the air compressor control system;

[0036] Taking the third air pressure as the center of the interval, determine the third air pressure floating interval;

[0037] The intelligent pressure control device that drives the industrial gas tank controls the air pressure of the industrial gas tank within the third air pressure floating range.

[0038] An air compressor control device is applied to an air compressor control system. The air compressor control device includes:

[0039] A variable-frequency air compressor frequency increase unit, which is used to drive the control cabinet of the variable-frequency air compressor in the air compressor control system to increase the frequency of the variable-frequency air compressor when the control cabinet of the variable-frequency air compressor in the air compressor control system receives an instruction from a remote terminal to increase the frequency to a preset target frequency;

[0040] A frequency compliance determination unit, which is used to determine whether the frequency of the air supply system reaches the preset target frequency when all the activated power-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in a full-load state. The air supply system includes the variable-frequency air compressor and each power-frequency air compressor. If not, the latest power-frequency machine determination unit is executed. If so, the variable-frequency air compressor frequency reduction unit is executed;

[0041] The latest power-frequency machine determination unit is used to determine the latest target power-frequency air compressor from each unactivated power-frequency air compressor in the air compressor control system, so that the remote terminal generates a start-up instruction for the target power-frequency air compressor;

[0042] A power-frequency machine start-up unit, which is used to drive the target power-frequency air compressor to start when the target power-frequency air compressor receives the start-up instruction from the remote terminal, and then return to execute the frequency compliance determination unit;

[0043] The frequency compliance determination unit is used to drive the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, so that the air consumption of the air compressor control system is balanced with the air production of the air compressor control system;

[0044] A frequency maintenance unit, which is used to determine a frequency floating range with the balance frequency as the center of the range, so that the control cabinet controls the frequency of the variable-frequency air compressor during operation within the frequency floating range.

[0045] Optionally, the air compressor control device further includes:

[0046] A first air pressure determination unit, which is used to determine the first air pressure at the outlet of the intermediate air storage tank of the air compressor control system after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency;

[0047] A first air pressure floating range determination unit, which is used to determine a first air pressure floating range with the first air pressure as the center of the range;

[0048] The intermediate gas storage tank air pressure control unit is used to drive the intelligent pressure control device of the intermediate gas storage tank to control the air pressure of the intermediate gas storage tank within the first air pressure floating range.

[0049] Optionally, the air compressor control device further includes:

[0050] The second air pressure determination unit is used to determine the second air pressure at the outlet of the instrument air tank of the air compressor control system after driving the control cabinet to reduce the frequency of the variable frequency air compressor until the balanced frequency;

[0051] The second air pressure floating range determination unit is used to determine the second air pressure floating range with the second air pressure as the center of the range;

[0052] The instrument air tank air pressure control unit is used to drive the intelligent pressure control device of the instrument air tank to control the air pressure of the instrument air tank within the second air pressure floating range.

[0053] Optionally, the air compressor control device further includes:

[0054] The third air pressure determination unit is used to determine the third air pressure at the outlet of the industrial gas tank of the air compressor control system after driving the control cabinet to reduce the frequency of the variable frequency air compressor until the balanced frequency;

[0055] The third air pressure floating range determination unit is used to determine the third air pressure floating range with the third air pressure as the center of the range;

[0056] The industrial gas tank air pressure control unit is used to drive the intelligent pressure control device of the industrial gas tank to control the air pressure of the industrial gas tank within the third air pressure floating range.

[0057] With the above technical solution, when the control cabinet of the variable-frequency air compressor in the air compressor control system of the present application receives an instruction from a remote terminal to increase the frequency to a preset target frequency, the control cabinet is driven to increase the frequency of the variable-frequency air compressor. When all the activated industrial-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in a full-load state, it is determined whether the frequency of the air supply system reaches the preset target frequency. The air supply system includes the variable-frequency air compressor and each industrial-frequency air compressor. If not, the latest target industrial-frequency air compressor is determined from each unactivated industrial-frequency air compressor in the air compressor control system, so that the remote terminal generates a startup instruction for the target industrial-frequency air compressor. When the target industrial-frequency air compressor receives the startup instruction from the remote terminal, the target industrial-frequency air compressor is driven to start, and the step of determining whether the frequency of the air supply system reaches the preset target frequency when all the activated industrial-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in a full-load state is returned for execution. If so, the control cabinet is driven to reduce the frequency of the variable-frequency air compressor until the balance frequency, so that the air consumption of the air compressor control system is balanced with the air production of the air compressor control system. Taking the balance frequency as the center of the interval, a frequency floating interval is determined, so that the control cabinet controls the frequency of the variable-frequency air compressor during operation within the frequency floating interval. Thus, due to the intervention of the variable-frequency air compressor, the frequency is adjusted based on the balance of air consumption and air production, so that the upper and lower pressures of the pipeline of the air compressor control system are stable, the fluctuation of the pressure can be reduced, the power loss caused by the upward fluctuation of the pressure can be reduced, thereby reducing the unloaded operation of the industrial-frequency air compressor, saving electric energy and reducing the maintenance amount at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0059] Figure 1 It is a schematic flowchart for implementing air compressor control provided by an embodiment of the present application;

[0060] Figure 2 It is the first structural topology diagram of the air compressor control system provided by an embodiment of the present application;

[0061] Figure 3 It is the second structural topology diagram of the air compressor control system provided by an embodiment of the present application;

[0062] Figure 4 It is the third structural topology diagram of the air compressor control system provided by an embodiment of the present application;

[0063] Figure 5 This is a schematic structural diagram of a device for realizing air compressor control provided by an embodiment of the present application. Specific implementation manners

[0064] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0065] The solution of the present application can be implemented based on a terminal with data processing capabilities. The terminal can be an air compressor control system, where the air compressor control system can include a variable-frequency air compressor and multiple power-frequency air compressors.

[0066] Specifically, the variable-frequency air compressor can be equipped with a joint control cabinet. The joint control cabinet can adjust the frequency of the variable-frequency air compressor upward and downward. The operating frequency of each power-frequency air compressor is fixed. The joint control cabinet and multiple power-frequency air compressors can all be communicatively connected to a remote terminal to receive command signals sent by the remote terminal.

[0067] Next, in combination with Figure 1 As described above, the air compressor control method of the present application can include the following steps:

[0068] Step S110: When the joint control cabinet of the variable-frequency air compressor in the air compressor control system receives an instruction from the remote terminal to increase the frequency to a preset target frequency, drive the joint control cabinet to increase the frequency of the variable-frequency air compressor.

[0069] Specifically, the preset target frequency can represent the frequency that the air supply system of the air compressor control system needs to reach.

[0070] Among them, the air supply system can include the variable-frequency air compressor and all power-frequency air compressors in the air compressor control system.

[0071] It can be understood that the instruction to increase the frequency to the preset target frequency can mean that the remote terminal needs to command the joint control cabinet to control the variable-frequency air compressor. The specific control event is to increase the frequency so that the frequency of the air supply system of the air compressor control system reaches the preset target frequency. Then the joint control cabinet can respond to this instruction and increase the frequency of the variable-frequency air compressor.

[0072] Step S120: Determine whether the frequency of the air supply system reaches the preset target frequency. If not, execute step S_{130}; if so, execute step S_{150}.

[0073] Specifically, when all the activated line-frequency air compressors and variable-frequency air compressors in the air compressor control system are in a full-load state, it is determined whether the frequency of the air supply system reaches a preset target frequency.

[0074] It can be understood that when the variable-frequency air compressor is in a full-load state, its frequency cannot be further increased, and all the activated line-frequency air compressors are also in a full-load state, indicating that the frequency that the current air supply system can increase has reached the saturation value.

[0075] Step S130: Determine the latest target line-frequency air compressor from all the unactivated line-frequency air compressors in the air compressor control system, so that the remote terminal generates a startup instruction for the target line-frequency air compressor.

[0076] Specifically, each line-frequency air compressor in the air compressor control system can have a startup priority ranking. When it is necessary to determine the line-frequency air compressor to be activated from all the unactivated line-frequency air compressors, the line-frequency air compressor with the highest startup priority can be determined as the target line-frequency air compressor.

[0077] For example, the air compressor control system includes 4 line-frequency air compressors and a variable-frequency air compressor. Among the 4 line-frequency air compressors, the 1st line-frequency air compressor has the highest startup priority, followed by the 2nd line-frequency air compressor, then the 3rd line-frequency air compressor, and finally the 4th line-frequency air compressor with the lowest priority. Currently, the variable-frequency air compressor and the 1st line-frequency air compressor are in a full-load state, and the frequency of the air supply system still does not reach the specified preset target frequency. Then, the 2nd line-frequency air compressor among the remaining three unactivated line-frequency air compressors can be determined as the target line-frequency air compressor for the remote terminal to generate a startup instruction for the 2nd line-frequency air compressor.

[0078] Step S140: When the target line-frequency air compressor receives the startup instruction from the remote terminal, drive the target line-frequency air compressor to start and return to execute step S120.

[0079] It can be understood that since the frequency of the line-frequency air compressor is fixed, after the line-frequency air compressor is started, its frequency will be input into the air supply system to increase the frequency of the air supply system. Then, after the frequency of the air supply system is increased, the step of determining whether the frequency of the air supply system reaches the preset target frequency can be executed again.

[0080] Step S150: Drive the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, so that the air consumption of the air compressor control system is balanced with the air production of the air compressor control system.

[0081] It can be understood that when the frequency of the air supply system is increased to the target frequency, since it is currently at the maximum value of frequency increase, the air consumption of the air compressor control system is not balanced with the air production. Therefore, it is necessary to reduce the frequency until the air consumption of the air compressor control system is balanced with the air production.

[0082] Specifically, the control cabinet can be driven to reduce the frequency of the variable-frequency air compressor, and the air consumption and air production of the air compressor control system can be monitored in real time. After the air consumption and air production of the air compressor control system are balanced, the frequency reduction is stopped, and the current frequency of the variable-frequency air compressor is determined as the balanced frequency.

[0083] Step S160: Taking the balanced frequency as the center of the interval, determine the frequency floating interval, so that the control cabinet controls the frequency of the variable-frequency air compressor during operation within the frequency floating interval.

[0084] Specifically, the lower limit of the frequency floating interval can represent the stable fluctuation value of the frequency of the variable-frequency air compressor below the balanced frequency, and the upper limit of the frequency floating interval can represent the stable fluctuation value of the frequency of the variable-frequency air compressor above the balanced frequency.

[0085] For the air compressor control method provided in this embodiment, when the control cabinet of the variable-frequency air compressor in the air compressor control system receives an instruction from the remote terminal to increase the frequency to the preset target frequency, the control cabinet is driven to increase the frequency of the variable-frequency air compressor. When all the started industrial-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in the full-load state, it is judged whether the frequency of the air supply system reaches the preset target frequency. The air supply system includes the variable-frequency air compressor and each industrial-frequency air compressor. If not, the latest target industrial-frequency air compressor is determined from each unstarted industrial-frequency air compressor in the air compressor control system, so that the remote terminal generates a start-up instruction for the target industrial-frequency air compressor. When the target industrial-frequency air compressor receives the start-up instruction from the remote terminal, the target industrial-frequency air compressor is driven to start, and the step of judging whether the frequency of the air supply system reaches the preset target frequency when all the started industrial-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in the full-load state is returned to be executed. If so, the control cabinet is driven to reduce the frequency of the variable-frequency air compressor until the balanced frequency, so that the air consumption of the air compressor control system is balanced with the air production of the air compressor control system. Taking the balanced frequency as the center of the interval, the frequency floating interval is determined, so that the control cabinet controls the frequency of the variable-frequency air compressor during operation within the frequency floating interval. Thus, due to the intervention of the variable-frequency air compressor, the frequency is adjusted based on the balance of air consumption and air production, so that the upper and lower pressures of the pipeline of the air compressor control system are stable, the pressure fluctuation can be reduced, the power loss caused by the upward pressure fluctuation is reduced, thereby reducing the unloaded operation of the industrial-frequency air compressor, saving electric energy and reducing the maintenance amount at the same time.

[0086] In some embodiments of the present application, the air compressor control system mentioned in the above embodiments is further introduced. Specifically, the air compressor control system may include a variable frequency air compressor, several industrial frequency air compressors, an intermediate gas storage tank, a cooling module, an adsorption drying module, an instrument gas tank and an industrial gas tank.

[0087] A topological structure of air compressor control system is as follows Figure 2 As shown, the air compressor control system includes a variable frequency air compressor, four industrial frequency air compressors, an intermediate gas storage tank, a cooling module, an adsorption drying module, an instrument gas tank and an industrial gas tank.

[0088] The variable frequency air compressor and each industrial frequency air compressor can be connected to the input end of the gas production main pipe.

[0089] The output end of the gas production main pipe can be connected to the input end of the cooling module through an intermediate gas storage tank.

[0090] The first output end of the cooling module can be connected to the instrument gas tank through the adsorption drying module.

[0091] The second output end of the cooling module can be connected to an industrial gas tank.

[0092] The variable frequency air compressor can be equipped with a joint control cabinet, which can be used to adjust the frequency of the variable frequency air compressor.

[0093] Thermal flow meters can be installed at the exhaust port of the variable frequency air compressor, the exhaust port of each power frequency air compressor, and the gas production main pipe to assist in measuring the gas production of the air compressor control system;

[0094] The outlets of intermediate gas storage tanks, instrument gas tanks, and industrial gas tanks can all be equipped with intelligent pressure control devices. Each intelligent pressure control device can have a built-in smart server to adjust the pressure within a reasonable and stable range according to the actual pressure requirements of the terminal.

[0095] The joint control cabinet, each power frequency air compressor, cooling module and adsorption drying module can all be connected to the remote terminal to enable the remote terminal to realize functions such as fault alarm, remote inspection, data query, and record query.

[0096] Furthermore, the adsorption drying module may include a blast-free air-consumption adsorption dryer or a plurality of adsorption dryers connected in parallel.

[0097] Among them, the air volume of the blast zero-gas consumption adsorption dryer is 65Nm 3 / h, the percentage of regeneration gas consumption of the blast zero gas consumption adsorption dryer is not higher than 0.05%, and the pressure dew point temperature range of the blast zero gas consumption adsorption dryer is -40℃~-20℃.

[0098] Further, the cooling module may include a rear cooling section or a plurality of refrigerant dryers connected in parallel with each other.

[0099] Among them, the rear cooling section may adopt a bypass mode, the processing air volume of the rear cooling section is 80 Nm 3 / h, the outlet air temperature of the rear cooling section under standard conditions is not higher than 45 °C, and the cooling mode of the rear cooling section is water-cooled.

[0100] When the adsorption drying module adopts a plurality of adsorption dryers connected in parallel with each other and a plurality of refrigerant dryers connected in parallel with each other, the air compressor control system is as Figure 3 shown.

[0101] When the adsorption drying module adopts a blast zero-consumption adsorption dryer and the cooling module adopts a rear cooling section, the air compressor control system is as Figure 4 shown.

[0102] Further, the variable frequency air compressor may be a screw air compressor.

[0103] Specifically, the variable frequency mode of the screw air compressor may be permanent magnet variable frequency, the screw air compressor may adopt a two-stage compression technology, the rated gas production pressure of the screw air compressor is between 0.6 MPa and 0.7 MPa, and the gas production volume of the screw air compressor is not less than 21 Nm 3 / h, and the cooling mode of the screw air compressor is water-cooled.

[0104] Further, valves are equipped at the inlets and outlets of the intermediate gas storage tank, the instrument gas tank, the industrial gas tank, each adsorption dryer, and each refrigerant dryer. Valves are equipped at the outlets of the variable frequency air compressor and each industrial frequency air compressor.

[0105] In some embodiments of the present application, the role played by the intelligent pressure control device mentioned in the above embodiments during the control of the air compressor is introduced. Specifically, after the driving control cabinet reduces the frequency of the variable frequency air compressor until the balance frequency in the above-mentioned embodiments, it may further include the intelligent pressure control device of the intermediate gas storage tank for the air pressure control process of the intermediate gas storage tank, the intelligent pressure control device of the instrument gas tank for the air pressure control process of the instrument gas tank, and the intelligent pressure control device of the industrial gas tank for the air pressure control process of the industrial gas tank.

[0106] Among them, the air pressure control process of the intelligent pressure control device of the intermediate gas storage tank for the intermediate gas storage tank may include:

[0107] S11. Determine the first air pressure at the outlet of the intermediate gas storage tank of the air compressor control system.

[0108] It can be understood that since the frequency of the variable-frequency air compressor has reached the balanced frequency, the first air pressure can represent the stable air pressure of the intermediate air storage tank in the stable operation state of the air compressor control system.

[0109] S12. Taking the first air pressure as the center of the interval, determine the first air pressure floating interval.

[0110] Specifically, the upper limit of the first air pressure floating interval can represent the stable fluctuation value of the air pressure in the intermediate air storage tank above the stable air pressure, and the lower limit of the first air pressure floating interval can represent the stable fluctuation value of the air pressure in the intermediate air storage tank below the stable air pressure.

[0111] S13. Drive the intelligent pressure control device of the intermediate air storage tank to control the air pressure of the intermediate air storage tank within the first air pressure floating interval.

[0112] It can be understood that the air pressure in the intermediate air storage tank is autonomously regulated by the intelligent pressure control device within the first air pressure floating interval, and the purpose of energy saving can be achieved.

[0113] The process of controlling the air pressure of the instrument air storage tank by the intelligent pressure control device of the instrument air storage tank may include:

[0114] S21. Determine the second air pressure at the outlet of the instrument air storage tank of the air compressor control system.

[0115] It can be understood that since the frequency of the variable-frequency air compressor has reached the balanced frequency, the second air pressure can represent the stable air pressure of the instrument air storage tank in the stable operation state of the air compressor control system.

[0116] S22. Taking the second air pressure as the center of the interval, determine the second air pressure floating interval.

[0117] Specifically, the upper limit of the second air pressure floating interval can represent the stable fluctuation value of the air pressure in the instrument air storage tank above the stable air pressure, and the lower limit of the second air pressure floating interval can represent the stable fluctuation value of the air pressure in the instrument air storage tank below the stable air pressure.

[0118] S23. Drive the intelligent pressure control device of the instrument air storage tank to control the air pressure of the instrument air storage tank within the second air pressure floating interval.

[0119] It can be understood that the air pressure in the instrument air storage tank is autonomously regulated by the intelligent pressure control device within the second air pressure floating interval, and the purpose of energy saving can be achieved.

[0120] The process of controlling the air pressure of the industrial air storage tank by the intelligent pressure control device of the industrial air storage tank may include:

[0121] S31. Determine the third air pressure at the outlet of the industrial air storage tank of the air compressor control system.

[0122] It can be understood that since the frequency of the variable-frequency air compressor has reached the balanced frequency, the third air pressure can represent the stable air pressure of the industrial air tank in the stable operation state of the air compressor control system.

[0123] S32. Taking the third air pressure as the center of the interval, determine the third air pressure floating interval.

[0124] Specifically, the upper limit of the third air pressure floating interval can represent the stable fluctuation value of the air pressure of the industrial air tank above the stable air pressure, and the lower limit of the third air pressure floating interval can represent the stable fluctuation value of the air pressure of the industrial air tank below the stable air pressure.

[0125] S33. The intelligent pressure control device that drives the industrial air tank controls the air pressure of the industrial air tank within the third air pressure floating interval.

[0126] It can be understood that the air pressure of the industrial air tank is automatically adjusted by the intelligent pressure control device within the third air pressure floating interval, which can achieve the purpose of energy saving.

[0127] Next, the device for realizing air compressor control provided by the embodiment of the present application will be described. The device for realizing air compressor control described below can be correspondingly referred to the method for realizing air compressor control described above.

[0128] See Figure 5 , Figure 5 which is a schematic structural diagram of a device for realizing air compressor control disclosed in the embodiment of the present application.

[0129] As Figure 5 shown, the device may include:

[0130] The variable-frequency air compressor frequency increase unit 11 is used to drive the control cabinet to increase the frequency of the variable-frequency air compressor when the control cabinet of the variable-frequency air compressor in the air compressor control system receives an instruction from the remote terminal to increase the frequency to a preset target frequency;

[0131] The frequency compliance determination unit 12 is used to judge whether the frequency of the air supply system reaches the preset target frequency when all the turned-on power-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in the full-load state. The air supply system includes the variable-frequency air compressor and each power-frequency air compressor. If not, the latest power-frequency machine determination unit 13 is executed. If so, the variable-frequency air compressor frequency decrease unit 15 is executed;

[0132] The latest power-frequency machine determination unit 13 is used to determine the latest target power-frequency air compressor from each unturned-on power-frequency air compressor in the air compressor control system, so that the remote terminal generates a start-up instruction for the target power-frequency air compressor;

[0133] The power-frequency machine startup unit 14 is used to drive the target power-frequency air compressor to start when the target power-frequency air compressor receives the startup instruction from the remote terminal, and then return to execute the frequency compliance determination unit 12;

[0134] The frequency compliance determination unit 15 is used to drive the control cabinet to reduce the frequency of the variable-frequency air compressor until the balanced frequency, so that the gas consumption of the air compressor control system is balanced with the gas production of the air compressor control system;

[0135] The frequency maintenance unit 16 is used to determine the frequency floating range with the balanced frequency as the interval center, so that the control cabinet controls the frequency of the variable-frequency air compressor during operation within the frequency floating range.

[0136] Optionally, the air compressor control system includes a variable-frequency air compressor, several power-frequency air compressors, an intermediate gas storage tank, a cooling module, an adsorption drying module, an instrument air tank, and an industrial air tank;

[0137] The variable-frequency air compressor and each power-frequency air compressor are connected to the input end of the gas production main pipe;

[0138] The output end of the gas production main pipe is connected to the input end of the cooling module through the intermediate gas storage tank;

[0139] The first output end of the cooling module is connected to the instrument air tank through the adsorption drying module;

[0140] The second output end of the cooling module is connected to the industrial air tank;

[0141] The variable-frequency air compressor is equipped with a control cabinet, and the control cabinet is used to adjust the frequency of the variable-frequency air compressor;

[0142] Thermal flow meters are installed at the exhaust ports of the variable-frequency air compressor, the exhaust ports of each power-frequency air compressor, and the gas production main pipe;

[0143] Intelligent pressure control devices are installed at the outlet of the intermediate gas storage tank, the outlet of the instrument air tank, and the outlet of the industrial air tank;

[0144] The control cabinet, each power-frequency air compressor, the cooling module, and the adsorption drying module are all connected to the remote terminal.

[0145] Optionally, the adsorption drying module includes a blower zero-consumption adsorption dryer or several mutually parallel adsorption dryers, and the processing air volume of the blower zero-consumption adsorption dryer is 65 Nm 3 / h, the percentage of the regeneration gas consumption of the blast zero-consumption air adsorption dryer is not higher than 0.05%, and the pressure dew point temperature range of the blast zero-consumption air adsorption dryer is -40°C to -20°C.

[0146] Optionally, the cooling module includes a rear cooling section or several mutually parallel refrigerant dryers. The processing air volume of the rear cooling section is 80 Nm 3 / h. The outlet air temperature of the rear cooling section under standard conditions is not higher than 45°C, and the cooling method of the rear cooling section is water-cooled.

[0147] Optionally, the variable-frequency air compressor is a screw air compressor. The variable-frequency method of the screw air compressor is permanent magnet variable frequency. The rated gas production pressure of the screw air compressor is between 0.6 MPa and 0.7 MPa. The gas production volume of the screw air compressor is not less than 21 Nm 3 / h, and the cooling method of the screw air compressor is water-cooled.

[0148] Optionally, after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balancing frequency, it further includes:

[0149] Determine the first air pressure at the outlet of the intermediate gas storage tank of the air compressor control system;

[0150] Taking the first air pressure as the interval center, determine the first air pressure floating interval;

[0151] Drive the intelligent pressure control device of the intermediate gas storage tank to control the air pressure of the intermediate gas storage tank within the first air pressure floating interval.

[0152] Optionally, after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balancing frequency, it further includes:

[0153] Determine the second air pressure at the outlet of the instrument gas storage tank of the air compressor control system;

[0154] Taking the second air pressure as the interval center, determine the second air pressure floating interval;

[0155] Drive the intelligent pressure control device of the instrument gas storage tank to control the air pressure of the instrument gas storage tank within the second air pressure floating interval.

[0156] Optionally, after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balancing frequency, it further includes:

[0157] Determine the third air pressure at the outlet of the industrial gas storage tank of the air compressor control system;

[0158] Taking the third air pressure as the interval center, determine the third air pressure floating interval;

[0159] The intelligent pressure control device for driving the industrial gas tank controls the air pressure of the industrial gas tank within the third air pressure floating range.

[0160] Optionally, the air compressor control device further includes:

[0161] A first air pressure determination unit, configured to determine a first air pressure at the outlet of the intermediate gas storage tank of the air compressor control system after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balanced frequency;

[0162] A first air pressure floating range determination unit, configured to determine a first air pressure floating range with the first air pressure as the center of the range;

[0163] An intermediate gas storage tank air pressure control unit, configured to drive the intelligent pressure control device of the intermediate gas storage tank to control the air pressure of the intermediate gas storage tank within the first air pressure floating range.

[0164] Optionally, the air compressor control device further includes:

[0165] A second air pressure determination unit, configured to determine a second air pressure at the outlet of the instrument gas tank of the air compressor control system after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balanced frequency;

[0166] A second air pressure floating range determination unit, configured to determine a second air pressure floating range with the second air pressure as the center of the range;

[0167] An instrument gas tank air pressure control unit, configured to drive the intelligent pressure control device of the instrument gas tank to control the air pressure of the instrument gas tank within the second air pressure floating range.

[0168] Optionally, the air compressor control device further includes:

[0169] A third air pressure determination unit, configured to determine a third air pressure at the outlet of the industrial gas tank of the air compressor control system after driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balanced frequency;

[0170] A third air pressure floating range determination unit, configured to determine a third air pressure floating range with the third air pressure as the center of the range;

[0171] An industrial gas tank air pressure control unit, configured to drive the intelligent pressure control device of the industrial gas tank to control the air pressure of the industrial gas tank within the third air pressure floating range.

[0172] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0173] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0174] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air compressor control method, characterized in that, Applied to the air compressor control system, the method includes: When the control cabinet of the variable-frequency air compressor in the air compressor control system receives an instruction from the remote terminal to increase the frequency to a preset target frequency, drive the control cabinet to increase the frequency of the variable-frequency air compressor; When all the activated industrial-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in a full-load state, determine whether the frequency of the air supply system reaches the preset target frequency, where the air supply system includes the variable-frequency air compressor and all the industrial-frequency air compressors; If not, determine the latest target industrial-frequency air compressor from all the unactivated industrial-frequency air compressors in the air compressor control system, so that the remote terminal generates a start-up instruction for the target industrial-frequency air compressor; When the target industrial-frequency air compressor receives the start-up instruction from the remote terminal, drive the target industrial-frequency air compressor to start, and return to execute the step of determining whether the frequency of the air supply system reaches the preset target frequency when all the activated industrial-frequency air compressors and the variable-frequency air compressor in the air compressor control system are in a full-load state; If so, drive the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, so that the air consumption of the air compressor control system is balanced with the air production of the air compressor control system; Taking the balance frequency as the center of the interval, determine the frequency floating interval, so that the control cabinet controls the frequency of the variable-frequency air compressor during operation within the frequency floating interval; The air compressor control system includes a variable-frequency air compressor, several industrial-frequency air compressors, an intermediate gas storage tank, a cooling module, an adsorption drying module, an instrument air tank, and an industrial air tank; The variable-frequency air compressor and each industrial-frequency air compressor are connected to the input end of the gas production main pipe; The output end of the gas production main pipe is connected to the input end of the cooling module through the intermediate gas storage tank; The first output end of the cooling module is connected to the instrument air tank through the adsorption drying module; The second output end of the cooling module is connected to the industrial air tank; The variable-frequency air compressor is equipped with a control cabinet, and the control cabinet is used to adjust the frequency of the variable-frequency air compressor; Thermal flow meters are installed at the exhaust ports of the variable-frequency air compressor, the exhaust ports of each industrial-frequency air compressor, and the gas production main pipe; Intelligent pressure control devices are installed at the outlets of the intermediate gas storage tank, the instrument air tank, and the industrial air tank; The control cabinet, each industrial-frequency air compressor, the cooling module, and the adsorption drying module are all connected to the remote terminal.

2. The method according to claim 1, wherein The adsorption drying module includes a blower zero-air-consumption adsorption dryer or several adsorption dryers connected in parallel. The processing air volume of the blower zero-air-consumption adsorption dryer is 65 Nm 3 / h. The percentage of the regeneration air consumption of the blower zero-air-consumption adsorption dryer is not higher than 0.05%. The pressure dew point temperature range of the blower zero-air-consumption adsorption dryer is -40°C to -20°C.

3. The method according to claim 1, wherein The cooling module includes a rear cooling section or a plurality of refrigerated dryers connected in parallel. The air volume processed by the rear cooling section is 80 Nm 3 / h. The outlet air temperature of the rear cooling section under standard conditions is not higher than 45 °C, and the cooling method of the rear cooling section is water-cooled.

4. The method according to claim 1, characterized in that, The variable-frequency air compressor is a screw air compressor. The variable-frequency method of the screw air compressor is permanent magnet variable frequency. The rated gas production pressure of the screw air compressor is between 0.6 MPa and 0.7 MPa. The gas production volume of the screw air compressor is not less than 21 Nm 3 / h. The cooling method of the screw air compressor is water-cooled.

5. The method according to any one of claims 1 to 4, characterized in that, After driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, it further includes: Determine the first air pressure at the outlet of the intermediate gas storage tank of the air compressor control system; Taking the first air pressure as the center of the interval, determine the first air pressure floating interval; Drive the intelligent pressure control device of the intermediate gas storage tank to control the air pressure of the intermediate gas storage tank within the first air pressure floating interval.

6. The method according to any one of claims 1-4, characterized in that After driving the control cabinet to reduce the frequency of the variable-frequency air compressor until the balance frequency, it further includes: Determine the second air pressure at the outlet of the instrument air tank of the air compressor control system; Taking the second air pressure as the center of the interval, determine the second air pressure floating interval; Drive the intelligent pressure control device of the instrument air tank to control the air pressure of the instrument air tank within the second air pressure floating interval.

7. The method according to any one of claims 1-4, characterized in that, After driving the control cabinet to reduce the frequency of the variable frequency air compressor until the balanced frequency, it further includes: Determine the third air pressure at the outlet of the industrial air tank of the air compressor control system; Taking the third air pressure as the center of the interval, determine the third air pressure floating interval; Drive the intelligent pressure control device of the industrial air tank to control the air pressure of the industrial air tank within the third air pressure floating interval.

8. An air compressor control device, characterized in that, Applied to the air compressor control system, the air compressor control device includes: A variable frequency air compressor frequency increase unit, configured to drive the control cabinet to increase the frequency of the variable frequency air compressor when the control cabinet of the variable frequency air compressor in the air compressor control system receives an instruction from a remote terminal to increase the frequency to a preset target frequency; A frequency compliance determination unit, configured to determine whether the frequency of the air supply system reaches the preset target frequency when each of the activated industrial frequency air compressors and the variable frequency air compressor in the air compressor control system are in a full load state. The air supply system includes the variable frequency air compressor and each industrial frequency air compressor. If not, execute the latest industrial frequency machine determination unit. If so, execute the variable frequency air compressor frequency reduction unit; The latest industrial frequency machine determination unit is configured to determine the latest target industrial frequency air compressor from each of the unactivated industrial frequency air compressors in the air compressor control system, so that the remote terminal generates a start-up instruction for the target industrial frequency air compressor; An industrial frequency machine start-up unit, configured to drive the target industrial frequency air compressor to start when the target industrial frequency air compressor receives the start-up instruction from the remote terminal, and return to execute the frequency compliance determination unit; The frequency compliance determination unit is configured to drive the control cabinet to reduce the frequency of the variable frequency air compressor until the balanced frequency, so that the air consumption of the air compressor control system is balanced with the air production of the air compressor control system; A frequency maintenance unit, configured to take the balanced frequency as the center of the interval and determine the frequency floating interval, so that the control cabinet controls the frequency of the variable frequency air compressor during operation within the frequency floating interval; The air compressor control system includes a variable frequency air compressor, several industrial frequency air compressors, an intermediate gas storage tank, a cooling module, an adsorption drying module, an instrument air tank, and an industrial air tank; The variable frequency air compressor and each industrial frequency air compressor are connected to the input end of the gas production main pipe; The output end of the gas production main pipe is connected to the input end of the cooling module through the intermediate gas storage tank; The first output end of the cooling module is connected to the instrument air tank through the adsorption drying module; The second output end of the cooling module is connected to the industrial air tank; The variable frequency air compressor is equipped with a control cabinet, and the control cabinet is used to adjust the frequency of the variable frequency air compressor; Thermal flow meters are installed at the exhaust ports of the variable frequency air compressor, the exhaust ports of each industrial frequency air compressor, and the gas production main pipe; Intelligent pressure control devices are installed at the outlets of the intermediate gas storage tank, the instrument air tank, and the industrial air tank; The control cabinet, each industrial frequency air compressor, the cooling module, and the adsorption drying module are all connected to the remote terminal.

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