An air pressure optimization control system based on terminal voltage stabilization

Abstract

The application discloses an air compression optimization control system based on terminal pressure stabilization, which comprises an air compression cluster control module and at least two terminal pressure stabilization control modules, the terminal pressure stabilization control module is connected with a workshop air inlet, and the air compression cluster control module is connected with all the terminal control modules. One end of a compressed air main pipe of the air compression cluster control module is connected with an air compressor cluster, and the other end is connected with all the terminal pressure stabilization control modules, and the air compressor cluster and the compressed air main pipe are electrically connected with an air compression cluster control master controller. One end of a compressed air sub-pipe of the terminal pressure stabilization control module is connected with the compressed air main pipe, and the other end is connected with the workshop air inlet, the compressed air sub-pipe is electrically connected with a terminal pressure stabilization controller, and the terminal pressure stabilization controller is electrically connected with the air compression cluster control master controller. The system can improve the operation efficiency of the air compressor set, maintain the system pressure stable, realize supply-demand balance and avoid energy waste.

Description

Technical Field

[0001] This invention relates to the field of energy-saving technology for compressed air systems, and in particular to an air compression optimization control system based on terminal pressure stabilization. Background Technology

[0002] With the development of industrial technology, the use of air in factory workshops is becoming increasingly frequent. In current technology, when multiple workshops use air, their needs are typically met by controlling the main pipeline pressure and starting / stopping the air compressors. Since the minimum operating pressure required by the air-using equipment in each workshop differs, controlling the air consumption of each workshop solely through the main pipeline pressure requires maintaining a relatively high pressure in the main pipeline to ensure that the workshop with the highest pressure requirement receives the air. This leads to an imbalance between supply and demand, resulting in energy waste. Furthermore, using main pipeline pressure control for workshop air consumption management easily causes frequent loading, unloading, and starting / stopping of air compressor units, which can even seriously affect the safety of air use in the workshops.

[0003] Furthermore, in actual operating conditions, the actual pressure at the inlet of each workshop often exceeds the minimum required pressure by 0.3 to 0.5 bar. On rest days, most workshops are shut down, and due to the lack of individual workshop gas control, all workshops must be supplied with gas, which further leads to energy waste. Summary of the Invention

[0004] Therefore, it is necessary to provide an air compressor optimization control system based on terminal pressure stabilization to address the above-mentioned technical problems. This system can improve the operating efficiency of the air compressor unit while maintaining stable system pressure, achieving supply and demand balance, and avoiding energy waste.

[0005] This invention provides an air compressor optimization control system based on end-point pressure stabilization, including an air compressor cluster control module and at least two end-point pressure stabilization control modules. The end-point pressure stabilization control modules are connected to the workshop air inlet, and the air compressor cluster control module is connected to all end-point control modules.

[0006] The air compressor cluster control module includes an air compressor group, an air compressor group control main controller, and a compressed air main pipe. One end of the compressed air main pipe is connected to the air compressor group, and the other end is connected to all the terminal pressure stabilization control modules. Both the air compressor group and the compressed air main pipe are electrically connected to the air compressor group control main controller.

[0007] The terminal pressure stabilization control module includes a terminal pressure stabilization controller and a compressed air sub-pipe. One end of the compressed air sub-pipe is connected to the compressed air main pipe, and the other end is connected to the workshop air inlet. The compressed air sub-pipe is electrically connected to the terminal pressure stabilization controller, and the terminal pressure stabilization controller is electrically connected to the compressed air group control main controller.

[0008] The terminal pressure regulator is used to collect the operating parameters of the compressed air sub-pipe and send the operating parameters of the compressed air sub-pipe to the air compressor group control main controller. It also generates adjustment parameters based on the operating parameters of the compressed air sub-pipe and the compressed air sub-pipe pressure setpoint obtained from the air compressor group control main controller to adjust the operating conditions of the compressed air sub-pipe.

[0009] The air compressor group control master controller is used to acquire the operating parameters of the compressed air sub-pipes and compressed air main pipes, and generate the operating parameters of each air compressor in the air compressor group and the pressure set value of the compressed air sub-pipes based on the operating parameters of the compressed air sub-pipes and compressed air main pipes. It also sends the operating parameters to the air compressor group and sends the pressure set value of the compressed air sub-pipes to the terminal pressure regulator.

[0010] In one embodiment, the compressed air main pipe consists of a main pipe pressure sensor and a first pipe section and a second pipe section connected in parallel. One end of the first pipe section is connected to the air compressor group and the other end is connected to the main pipe pressure sensor. One end of the second pipe section is connected to the air compressor group and the other end is connected to the main pipe pressure sensor.

[0011] Both the first and second pipe sections are equipped with a main pipe regulating valve and a main pipe flow meter. The main pipe pressure sensor, the main pipe regulating valve, and the main pipe flow meter are all electrically connected to the air compressor group control main controller.

[0012] In one embodiment, the compressed air sub-pipe is equipped with a sub-pipe pressure sensor, a sub-pipe flow meter, and a smart regulating valve, all of which are electrically connected to the end pressure regulator.

[0013] In one embodiment, the air compressor group includes multiple screw compressor units and multiple centrifugal compressor units;

[0014] The screw compressor unit starts, stops, or loads / unloads the air load output to the compressed air header according to the operating parameters. The centrifugal compressor unit controls the opening of the IGV and / or BOV according to the operating parameters to adjust the air load output to the compressed air header.

[0015] In one embodiment, the air compressor cluster control module further includes an air storage tank, one end of which is connected to the air compressor, and the ends of the first pipe section and the second pipe section away from the main pipe pressure sensor are both connected to the other end of the air storage tank.

[0016] In one embodiment, the operating parameters of the compressed air main pipe include the pressure and flow rate of the compressed air main pipe, the operating parameters of the compressed air sub-pipe include the pressure and flow rate of the compressed air sub-pipe, and the adjustment parameter is the opening degree of the intelligent regulating valve.

[0017] In one embodiment, the end-point voltage regulator uses a PID control algorithm to control the opening of the intelligent regulating valve.

[0018] In one embodiment, the control range of the main pipe regulating valve in the first pipe section is greater than the control range of the main pipe regulating valve in the second pipe section, and the range of the main pipe flow meter in the first pipe section is greater than the range of the main pipe flow meter in the second pipe section.

[0019] In one embodiment, the end voltage regulator controller is connected to the air compressor group controller via optical fiber.

[0020] The beneficial effects of this invention are:

[0021] (1) Through the mutual linkage of the air compressor cluster control module and the terminal pressure stabilization control module, the system can achieve energy-saving operation. While improving the operating efficiency of the air compressor unit, it can maintain the stability of the system pressure, achieve supply and demand balance, and avoid waste of resources.

[0022] (2) The terminal pressure stabilization control module adopts PID control. By controlling the opening of the intelligent control valve, the pressure of the compressed air sub-pipe is regulated, which can reduce the gas pressure in each workshop and reduce the pressure fluctuation of the pipeline network, thus achieving the effect of energy saving.

[0023] (3) The control range of the main pipe regulating valve and the range of the main pipe flow meter of the first and second pipe sections are different, which enables the compressed air main pipe to adapt to the working conditions corresponding to different flow rates, and the obtained working condition parameters of the compressed air main pipe are more accurate, making the operating parameters generated by the air compressor group control main controller and the pressure setting value of the compressed air sub-pipe more precise. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the air compressor optimization control system based on end-point voltage stabilization provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the control flow of the PID control algorithm provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached diagram: 1. Air compressor group; 2. Air tank; 3. Main pipe regulating valve; 4. Main pipe flow meter; 5. Main pipe pressure sensor; 6. Air compressor group control main controller; 7. Sub-pipe flow meter; 8. Intelligent regulating valve; 9. Sub-pipe pressure sensor; 10. Terminal pressure regulator. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] It should be noted that in the description of this invention, "upper," "lower," "top," "bottom," and orientation or positional relationship are based on the appendix. Figure 1The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0029] In one embodiment, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the air compressor optimization control system based on end-point pressure stabilization provided in an embodiment of the present invention. In this embodiment, the air compressor optimization control system based on end-point pressure stabilization includes an air compressor cluster control module and at least two end-point pressure stabilization control modules. The end-point pressure stabilization control modules are connected to the workshop air inlet, and the air compressor cluster control module is connected to all end-point control modules.

[0030] It should be noted that this embodiment specifically uses an example with two terminal pressure stabilization control modules, i.e., a factory with two gas-consuming workshops, to illustrate the air compressor optimization control system based on terminal pressure stabilization. In actual use, the air compressor cluster control module is located in the air compressor station, and the terminal pressure stabilization control module is located in the gas-consuming workshop, with the number of terminal pressure stabilization control modules matching the number of gas-consuming workshops.

[0031] The air compressor cluster control module includes an air compressor group 1, an air compressor group control master controller 6, and a compressed air header. One end of the compressed air header is connected to the air compressor group 1, and the other end is connected to all end pressure stabilization control modules. Both the air compressor group 1 and the compressed air header are electrically connected to the air compressor group control master controller 6. The air compressor group 1 is used to produce compressed air and deliver it to the compressed air header.

[0032] In this embodiment, the terminal pressure stabilization control module includes a terminal pressure stabilization controller 10 and compressed air sub-pipes. One end of the compressed air sub-pipe is connected to the compressed air main pipe, and the other end is connected to the workshop air inlet. The compressed air sub-pipes are electrically connected to the terminal pressure stabilization controller 10, and the terminal pressure stabilization controller 10 is electrically connected to the compressed air group control main controller 6. The terminal pressure stabilization controller 10 and the compressed air group control main controller 6 cooperate to control the air consumption regulation of the entire system. All compressed air sub-pipes are connected to the compressed air main pipe.

[0033] Specifically, the control method in which the terminal pressure regulator 10 and the air compressor group control master controller 6 cooperate is as follows: The terminal pressure regulator 10 is used to collect the operating parameters of the compressed air sub-pipes and send the operating parameters of the compressed air sub-pipes to the air compressor group control master controller 6. It also generates adjustment parameters based on the operating parameters of the compressed air sub-pipes and the compressed air sub-pipe pressure setpoints obtained from the air compressor group control master controller 6 to adjust the operating conditions of the compressed air sub-pipes. The air compressor group control master controller 6 is used to acquire the operating parameters of the compressed air sub-pipes and the compressed air main pipe, and generates the operating parameters of each air compressor within the air compressor group 1 and the compressed air sub-pipe pressure setpoints based on these parameters. It also sends the operating parameters to the air compressor group 1 and the compressed air sub-pipe pressure setpoints to the terminal pressure regulator 10.

[0034] In this embodiment, the air compressor optimization control system based on terminal pressure stabilization obtains the operating parameters of the compressed air main pipe and the compressed air sub-pipe through the mutual linkage of the air compressor cluster control module and the terminal pressure stabilization control module. It generates the operating parameters for controlling the air compressor group 1 and the adjustment parameters for the compressed air sub-pipe, and together achieves the energy-saving operation of the system. While improving the operating efficiency of the air compressor unit, it can maintain the stability of the system pressure and achieve supply and demand balance.

[0035] In one embodiment, the compressed air main pipe consists of a main pipe pressure sensor 5 and a first pipe section and a second pipe section connected in parallel. One end of the first pipe section is connected to the air compressor group 1, and the other end is connected to the main pipe pressure sensor 5. One end of the second pipe section is connected to the air compressor group 1, and the other end is connected to the main pipe pressure sensor 5. Both the first pipe section and the second pipe section are equipped with a main pipe regulating valve 3 and a main pipe flow meter 4. The main pipe pressure sensor 5, the main pipe regulating valve 3, and the main pipe flow meter 4 are all electrically connected to the air compressor group control main controller 6.

[0036] Specifically, the control range of the main pipe regulating valve 3 in the first pipe section is larger than that in the second pipe section, and the range of the main pipe flowmeter 4 in the first pipe section is larger than that in the second pipe section. The different control ranges of the main pipe regulating valve 3 and the different ranges of the main pipe flowmeter 4 in the first and second pipe sections allow the compressed air main pipe to adapt to different flow rates and operating conditions. For example, when the system is operating at full load or high load, gas flows through the first pipe section, and the main pipe regulating valve 3 in the second pipe section is closed. In this case, the larger range main pipe flowmeter 4 has higher measurement accuracy. When operating at low load or during weekends, gas can be selected to flow through the second pipe section, and the smaller range main pipe flowmeter 4 has higher measurement accuracy. Using different pipe sections for different flow rates results in more accurate operating parameters for the compressed air main pipe, making the operating parameters generated by the compressed air group control main controller 6 and the pressure setpoints of the compressed air sub-pipes more precise.

[0037] In one embodiment, the compressed air sub-pipe is equipped with a sub-pipe pressure sensor 9, a sub-pipe flow meter 7, and a smart regulating valve 8. All three are electrically connected to the end-point pressure regulator 10. The end-point pressure regulator 10 acquires the measurement data from the sub-pipe pressure sensor 9 and the sub-pipe flow meter 7, and sends regulation parameters to the smart control valve.

[0038] In one embodiment, the air compressor group 1 includes multiple screw compressor units and multiple centrifugal compressor units. The screw compressor units start, stop, or load / unload according to operating parameters to adjust the air load output to the compressed air header. The centrifugal compressor units control the opening of the IGV (inlet guide vane) and / or BOV (vent valve) according to operating parameters to adjust the air load output to the compressed air header, so as to ensure that the system air pressure tends to be stable.

[0039] Preferably, the air compressor cluster control module further includes an air storage tank 2. One end of the air storage tank 2 is connected to the air compressor, and the ends of the first and second pipe sections furthest from the main pipe pressure sensor 5 are both connected to the other end of the air storage tank 2. The air storage tank 2 is used to store and process the compressed air generated by the air compressor cluster 1, and the resulting clean compressed air is input into the compressed air main pipe.

[0040] In one embodiment, the operating parameters of the compressed air main pipe include the pressure and flow rate of the compressed air main pipe, the operating parameters of the compressed air sub-pipe include the pressure and flow rate of the compressed air sub-pipe, and the adjustment parameter is the opening degree of the intelligent regulating valve 8.

[0041] In an optional embodiment, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the PID control algorithm control flow provided in this embodiment of the invention. The terminal pressure regulator 10 uses the PID control algorithm to control the opening of the intelligent regulating valve 8. By controlling the opening of the intelligent control valve, the pressure is regulated so that the terminal pressure of each terminal pressure regulator module reaches the target pressure.

[0042] Since the terminal voltage regulator 10 is installed at the entrance of each workshop, while the air compressor group control main controller 6 is installed inside the air compressor station, and the distance between them is relatively far, the terminal voltage regulator 10 and the air compressor group control main controller 6 are connected via optical fiber. Furthermore, the communication protocols of different air compressor devices are not entirely the same; all device protocols must be converted to a universal protocol before the air compressor can establish communication with the air compressor group control main controller 6. Workstations, process optimization computers, servers, etc., are interconnected and exchange data via Ethernet through a core switch.

[0043] In addition, in the event of communication interruption, power outage, or gas outage, the intelligent control valve selected by the terminal pressure stabilization control system will immediately and automatically open fully for protection. At this time, the air compressor group control system can adjust the air compressor through the main pipe pressure and gas load, which will not affect normal production and ensure the safe operation of the air compressor room.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An air compressor optimization control system based on terminal voltage stabilization, characterized in that, It includes an air compressor cluster control module and at least two terminal pressure stabilization control modules. The terminal pressure stabilization control modules are connected to the workshop air inlet, and the air compressor cluster control module is connected to all terminal control modules. The air compressor cluster control module includes an air compressor group (1), an air compressor group control main controller (6), and a compressed air main pipe. One end of the compressed air main pipe is connected to the air compressor group (1), and the other end is connected to all end pressure stabilization control modules. The air compressor group (1) and the compressed air main pipe are both electrically connected to the air compressor group control main controller (6). The terminal pressure stabilization control module includes a terminal pressure stabilization controller (10) and a compressed air sub-pipe. One end of the compressed air sub-pipe is connected to the compressed air main pipe, and the other end is connected to the workshop air inlet. The compressed air sub-pipe is electrically connected to the terminal pressure stabilization controller (10), and the terminal pressure stabilization controller (10) is electrically connected to the air compressor group control main controller (6). The end pressure regulator (10) is used to collect the operating parameters of the compressed air sub-pipe and send the operating parameters of the compressed air sub-pipe to the air compressor group control main controller (6), and generate adjustment parameters to adjust the operating conditions of the compressed air sub-pipe according to the operating parameters of the compressed air sub-pipe and the compressed air sub-pipe pressure set value obtained from the air compressor group control main controller (6). The air compressor group control master controller (6) is used to obtain the operating parameters of the compressed air sub-pipe and the compressed air main pipe, and generate the operating parameters of each air compressor in the air compressor group (1) and the pressure setting value of the compressed air sub-pipe according to the operating parameters of the compressed air sub-pipe and the compressed air main pipe, and send the operating parameters to the air compressor group (1) and send the pressure setting value of the compressed air sub-pipe to the end pressure regulator (10); The compressed air main pipe consists of a main pipe pressure sensor (5) and a first pipe section and a second pipe section connected in parallel. One end of the first pipe section is connected to the air compressor group (1) and the other end is connected to the main pipe pressure sensor (5). One end of the second pipe section is connected to the air compressor group (1) and the other end is connected to the main pipe pressure sensor (5). Both the first and second pipe sections are equipped with a main pipe regulating valve (3) and a main pipe flow meter (4). The main pipe pressure sensor (5), the main pipe regulating valve (3) and the main pipe flow meter (4) are all electrically connected to the air compressor group control main controller (6). The compressed air sub-pipe is equipped with a sub-pipe pressure sensor (9), a sub-pipe flow meter (7), and an intelligent regulating valve (8). The sub-pipe pressure sensor (9), the sub-pipe flow meter (7), and the intelligent regulating valve (8) are all electrically connected to the end pressure regulator (10). The operating parameters of the compressed air main pipe include the pressure and flow rate of the compressed air main pipe, the operating parameters of the compressed air sub-pipe include the pressure and flow rate of the compressed air sub-pipe, and the adjustment parameter is the opening degree of the intelligent regulating valve (8). The terminal voltage regulator (10) uses a PID control algorithm to control the opening degree of the intelligent regulating valve (8).

2. The air compressor optimization control system based on end-point voltage stabilization according to claim 1, characterized in that, The air compressor group (1) includes multiple screw compressor units and multiple centrifugal compressor units; The screw compressor unit starts, stops, or loads / unloads the air load output to the compressed air main pipe according to the operating parameters, and the centrifugal compressor unit controls the opening of the IGV and / or BOV according to the operating parameters to adjust the air load output to the compressed air main pipe.

3. The air compressor optimization control system based on terminal voltage stabilization according to claim 2, characterized in that, The air compressor cluster control module also includes an air storage tank (2), one end of which is connected to the air compressor, and the ends of the first pipe section and the second pipe section away from the main pipe pressure sensor (5) are both connected to the other end of the air storage tank (2).

4. The air compressor optimization control system based on end-point voltage stabilization according to claim 1, characterized in that, The control range of the main pipe regulating valve (3) installed in the first pipe section is greater than the control range of the main pipe regulating valve (3) installed in the second pipe section, and the range of the main pipe flow meter (4) installed in the first pipe section is greater than the range of the main pipe flow meter (4) installed in the second pipe section.

5. The air compressor optimization control system based on end-point voltage stabilization according to claim 1, characterized in that, The terminal voltage regulator (10) is connected to the air compressor group controller (6) via optical fiber.

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