Compressor control system and method capable of automatically starting and stopping based on pressure change of storage tank

Abstract

The invention discloses a compressor control system and method capable of automatically starting and stopping based on pressure change of a storage tank, the control system comprises a compressor and a central control room console for controlling the operation of the compressor, and the control system is characterized in that a control detection system comprises a control module, an analysis early warning module, a starting button and a self-starting button, a process gas outlet of the compressor is connected with a gas inlet end of the process storage tank, a gas outlet end of the process storage tank is communicated to a process site, the pressure storage tank is provided with a pressure transmitter, the main oil pump is provided with an oil supply temperature sensor and an oil supply pressure sensor, and the main motor is provided with an emergency stop button, a stop button and an interlocking stop system. An emergency stop button sensor is arranged on the emergency stop button; the control method is used for automatically starting and stopping the compressor according to the pressure change of the pressure storage tank. Corresponding automatic control valves and instruments are additionally arranged in the unit, and the compressor can be started and stopped at any time by monitoring the pressure of the storage tank.

Description

Technical Field

[0001] The present invention relates to an improved invention of a reciprocating piston compressor, and in particular to an improved invention of a compressor control system and method for automatically starting and stopping based on changes in tank pressure. Background Art

[0002] For large-scale pressure storage tanks used in petrochemical sites, since the demand for gas sources in the process is constantly changing, when the demand is too large, it will cause large fluctuations in the pressure of the tank. When the tank pressure drops to a certain value, it will not be able to fully meet the needs of the process, which may cause the subsequent equipment to be forced to shut down and stop production, causing great property losses to the owner. At this time, it is necessary to develop a logic control solution that can control the automatic start and stop of the compressor according to the pressure conditions of the tank, and replenish gas and pressurize the tank in time to ensure the stable operation of the subsequent process. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a compressor control system and method for automatic start and stop based on tank pressure changes.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions: a compressor control system that automatically starts and stops based on changes in tank pressure, including a compressor and a central control room console that controls the operation of the compressor, the compressor including a main oil pump, a main motor, a final return regulating valve, a process gas inlet valve, a process gas outlet valve, a shaft side unloading solenoid valve and a cover side unloading solenoid valve, the central control room console is provided with a control detection system, characterized in that: the control detection system includes a control module, an analysis and early warning module, a start button and a self-start button, the process gas outlet of the compressor is connected to the air inlet end of the process tank, the air outlet end of the process tank is connected to the process site, the pressure tank is equipped with a pressure transmitter, the main oil pump is equipped with an oil supply temperature sensor and an oil supply pressure sensor, and the main motor is equipped with an emergency stop button. button, stop button and interlock parking system, the emergency stop button is provided with an emergency stop button sensor; the control module is used to control the opening and closing of the main oil pump, the main motor, the last return regulating valve, the process gas inlet valve, the process gas outlet valve, the shaft side unloading solenoid valve and the cover side unloading solenoid valve, the last return regulating valve, the process gas inlet valve, the process gas outlet valve, the shaft side unloading solenoid valve and the cover side unloading solenoid valve are respectively equipped with valve sensors and actuators, and the actuators are electrically connected to the control module; the analysis and early warning module is used to collect data from each sensor, display the opening of each valve channel, analyze and judge the data, and then push the early warning information to the control module, the pressure transmitter, interlock parking system, emergency stop button sensor, oil supply pressure sensor, oil supply temperature sensor, valve sensor are all electrically connected to the analysis and early warning module.

[0005] Preferably, the interlock parking system includes a lubricating oil pressure sensor, a first-stage intake pressure sensor, a first-stage exhaust temperature sensor, a second-stage exhaust temperature sensor, and a fuselage vibration sensor arranged on the compressor, and each sensor is electrically connected to the analysis and early warning module.

[0006] Preferably, the last return regulating valve and the main motor are both provided with a delay switch.

[0007] Preferably, the compressor further includes an auxiliary oil pump, and the control module controls the opening and closing of the auxiliary oil pump.

[0008] A compressor control method for automatic start and stop based on tank pressure change, characterized by comprising the following method steps: Step 1: Press the start button to start the startup procedure. If the oil supply temperature of the compressor oil station is ≥10°C, start the main oil pump to pump oil; Step 2: Open the last return regulating valve to 100%, open the cover side unloading solenoid valve and the shaft side unloading solenoid valve, open the process gas inlet valve, and open the process gas outlet valve; Step 3: When the last return regulating valve is open 100%, the main motor emergency stop button is not actuated, the process gas inlet valve is fully opened, the process gas outlet valve is fully opened, the process interlock signal is checked and there is no interlock, the oil supply pressure is ≥0.25MPa, and the oil supply temperature is ≥10℃, proceed to the next step; Step 4: Start the main motor, delay 5s, and transmit the main motor running signal to the control monitoring system, and the main motor start-up is completed; Step 5: After the main motor runs for 30 seconds, close the cover side unloading solenoid valve and the shaft side unloading solenoid valve; Step 6: Delay 15 seconds to close the last return regulating valve. If the return state is ≤5%, the compressor is started; Step 7. When the tank pressure is ≥5.31MPa, open the cover side unloading solenoid valve and the shaft side unloading solenoid valve, open the last return regulating valve to 100%, delay 15s to stop the main motor, transmit the main motor stop signal to the control system, close the process gas inlet valve, and close the process gas outlet valve; Step 8. Press the automatic start button to start the automatic start program. When the pressure transmitter detects that the process tank pressure is less than 3.5MPaG, it transmits the process tank pressure signal to the analysis and early warning module. After analysis by the analysis and early warning module, steps 2 to 7 are automatically performed through the control module.

[0009] Preferably, the startup procedure is equipped with a timer and an alarm. When the timing is started, if the startup is completed within 120 seconds, the timer is reset. If the startup is not completed within 120 seconds, an alarm is sounded.

[0010] Preferably, when the interlock parking system is in operation of the compressor, when the lubricating oil pressure is ≤0.15MPa or the first-stage intake pressure is ≤0.12MPa or the first-stage exhaust temperature is ≥112°C or the second-stage exhaust temperature is ≥112°C or the body vibration is ≥7.2mm / s, an alarm is issued and the main motor is stopped, the cover side unloading solenoid valve and the shaft side unloading solenoid valve are opened, the last return regulating valve is opened to 100%, the process gas inlet valve is closed, the process gas outlet valve is closed, and the automatic start-up program is cut off.

[0011] Preferably, when the compressor is running, the emergency stop button is pressed to stop the main motor, close the process gas inlet valve, close the process gas outlet valve, and cut off the automatic start-up program.

[0012] Preferably, when the compressor is running, the stop button is pressed on site to stop the main motor. The main motor stop signal is transmitted to the analysis and early warning module. After analysis, the control module opens the cover side unloading solenoid valve and the shaft side unloading solenoid valve, opens the last return regulating valve to 100%, closes the process gas inlet valve, closes the process gas outlet valve, and cuts off the automatic start-up program.

[0013] Preferably, when the oil supply pressure is ≤0.28MPa, the main oil pump and the auxiliary oil pump are automatically started at the same time, and when the oil supply pressure is ≥0.45MPa, an alarm is issued and the auxiliary oil pump is manually stopped.

[0014] The beneficial effect of the present invention is an improved compressor control system and method for automatic start and stop based on tank pressure changes. By adding corresponding automatic control valves and instruments to the unit and monitoring the pressure of the tank, the compressor can be started and stopped at any time. When the tank pressure is lower than the set value, the compressor automatically starts; when the tank pressure is higher than the set value, the compressor automatically stops. The control system has excellent applicability to process compressors, realizes the "intelligentization and digitization" of the unit, greatly reduces the workload of compressor operators, and also increases safety protection for the changeable process system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the start-up procedure and the self-starting procedure flow of the compressor of the present invention.

[0017] Figure 2 It is a schematic diagram of the auxiliary machine control program flow of the compressor of the present invention.

[0018] Figure 3 It is a schematic diagram of the shutdown procedure flow of the compressor of the present invention. DETAILED DESCRIPTION

[0019] The accompanying drawings show the structure of the present invention, and the relevant details are further explained below in conjunction with the accompanying drawings. A compressor control system that automatically starts and stops based on changes in tank pressure, including a compressor and a central control room console that controls the operation of the compressor, the compressor including a main oil pump, a main motor, a final return regulating valve, a process gas inlet valve, a process gas outlet valve, a shaft side unloading solenoid valve, and a cover side unloading solenoid valve, the central control room console is provided with a control detection system, the control detection system includes a control module, an analysis and early warning module, a start button, and a self-start button, the process gas outlet of the compressor is connected to the air inlet end of the process tank, and the air outlet end of the process tank is connected to the process site, the pressure tank is equipped with a pressure transmitter, the main oil pump is equipped with an oil supply temperature sensor and an oil supply pressure sensor, the main motor is equipped with an emergency stop button, a stop button, and an interlocking parking system, and the emergency stop An emergency stop button sensor is provided on the car button; the control module is used to control the opening and closing of the main oil pump, the main motor, the last return regulating valve, the process gas inlet valve, the process gas outlet valve, the shaft side unloading solenoid valve and the cover side unloading solenoid valve, and the last return regulating valve, the process gas inlet valve, the process gas outlet valve, the shaft side unloading solenoid valve and the cover side unloading solenoid valve are respectively equipped with valve sensors and actuators, and the actuators are electrically connected to the control module; the analysis and early warning module is used to collect data from each sensor, display the opening of each valve channel, analyze and judge the data, and then push the early warning information to the control module, and the pressure transmitter, interlock parking system, emergency stop button sensor, oil supply pressure sensor, oil supply temperature sensor, and valve sensor are all electrically connected to the analysis and early warning module.

[0020] As a further improved specific implementation method, the interlock parking system includes a lubricating oil pressure sensor, a first-level intake pressure sensor, a first-level exhaust temperature sensor, a second-level exhaust temperature sensor, and a fuselage vibration sensor installed on the compressor. Each sensor is electrically connected to the analysis and early warning module to monitor and analyze the lubricating oil pressure, first-level intake pressure, first-level exhaust temperature, second-level exhaust temperature, and fuselage vibration data respectively.

[0021] As a further improved specific implementation method, the last return regulating valve and the main motor are both provided with a delay switch.

[0022] As a further improved specific implementation method, the compressor also includes an auxiliary oil pump, and the control module controls the opening and closing of the auxiliary oil pump.

[0023] A compressor control method for automatic start and stop based on tank pressure change, comprising the following method steps: Step 1: Press the start button to start the startup procedure. If the oil supply temperature of the compressor oil station is ≥10°C, start the main oil pump to pump oil; Step 2: Open the last return regulating valve to 100%, open the cover side unloading solenoid valve and the shaft side unloading solenoid valve, open the process gas inlet valve, and open the process gas outlet valve; Step 3: When the last return regulating valve is open 100%, the main motor emergency stop button is not actuated, the process gas inlet valve is fully opened, the process gas outlet valve is fully opened, the process interlock signal is checked and there is no interlock, the oil supply pressure is ≥0.25MPa, and the oil supply temperature is ≥10℃, proceed to the next step; Step 4: Start the main motor, delay 5s, and transmit the main motor running signal to the control monitoring system, and the main motor start-up is completed; Step 5: After the main motor runs for 30 seconds, close the cover side unloading solenoid valve and the shaft side unloading solenoid valve; Step 6: Delay 15 seconds to close the last return regulating valve. If the reflux state is ≤5%, the compressor startup is completed. Preferably, the last return regulating valve is closed within 5 seconds, and is closed by 20% per second. Step 7. When the tank pressure is ≥5.31MPa, open the cover side unloading solenoid valve and the shaft side unloading solenoid valve, open the last return regulating valve to 100%, delay 15s to stop the main motor, transmit the main motor stop signal to the control system, close the process gas inlet valve, and close the process gas outlet valve; Step 8. Press the automatic start button to start the automatic start program. When the pressure transmitter detects that the process tank pressure is less than 3.5MPaG, it transmits the process tank pressure signal to the analysis and early warning module. After analysis by the analysis and early warning module, steps 2 to 7 are automatically performed through the control module. As a further improved specific implementation method, the startup program is equipped with a timer and an alarm. When the timing is started, if the startup is completed within 120 seconds, the timer is reset. If the startup is not completed within 120 seconds, an alarm is sounded, and then staff are arranged to go to the site for maintenance.

[0024] As a further improved specific implementation method, when the interlock parking system is in operation of the compressor, when the lubricating oil pressure is ≤0.15MPa or the first-level intake pressure is ≤0.12MPa or the first-level exhaust temperature is ≥112℃ or the second-level exhaust temperature is ≥112℃ or the body vibration is ≥7.2mm / s, an alarm will be issued and the main motor will be stopped, the cover side unloading solenoid valve and the shaft side unloading solenoid valve will be opened, the last return regulating valve will be opened to 100%, the process gas inlet valve will be closed, the process gas outlet valve will be closed, and the automatic start-up program will be cut off.

[0025] As a specific implementation method for further improvement, when the compressor is running, the emergency stop button is pressed to stop the main motor, close the process gas inlet valve, close the process gas outlet valve, and cut off the automatic start-up program.

[0026] As a specific implementation method for further improvement, when the compressor is running, the stop button is pressed on site to stop the main motor. The main motor stop signal is transmitted to the analysis and early warning module. After analysis, the control module opens the cover side unloading solenoid valve and the shaft side unloading solenoid valve, opens the last return regulating valve to 100%, closes the process gas inlet valve, closes the process gas outlet valve, and cuts off the automatic start-up program.

[0027] As a further improved specific implementation method, when the oil supply pressure is ≤0.28MPa, the main oil pump and the auxiliary oil pump are automatically started at the same time, and when the oil supply pressure is ≥0.45MPa, an alarm is issued, the auxiliary oil pump is manually stopped, and then staff are arranged to go to the site for maintenance.

[0028] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressor control system that automatically starts and stops based on tank pressure changes, including a compressor and a central control room console that controls the operation of the compressor, the compressor includes a main oil pump, a main motor, a final return regulating valve, a process gas inlet valve, a process gas outlet valve, a shaft side unloading solenoid valve and a cover side unloading solenoid valve, and the central control room console is provided with a control detection system, characterized in that: The control and detection system includes a control module, an analysis and warning module, a start button and a self-start button. The process gas outlet of the compressor is connected to the air inlet end of the process storage tank, and the air outlet end of the process storage tank is connected to the process site. The pressure storage tank is equipped with a pressure transmitter, the main oil pump is equipped with an oil supply temperature sensor and an oil supply pressure sensor, the main motor is equipped with an emergency stop button, a stop button and an interlocking parking system, and the emergency stop button is provided with an emergency stop button sensor; the control module is used to control the main oil pump, the main motor, the last return regulating valve, the process gas inlet valve, the process gas outlet valve, the shaft side unloading valve, ... The opening and closing of the load solenoid valve and the cover side unloading solenoid valve, the last return regulating valve, the process gas inlet valve, the process gas outlet valve, the shaft side unloading solenoid valve and the cover side unloading solenoid valve are respectively equipped with valve sensors and actuators, and the actuators are electrically connected to the control module; the analysis and early warning module is used to collect data from each sensor, display the opening of each valve channel, and analyze and judge the data, and then push the early warning information to the control module, the pressure transmitter, interlock parking system, emergency stop button sensor, oil supply pressure sensor, oil supply temperature sensor, valve sensor are all electrically connected to the analysis and early warning module.

2. The compressor control system for automatic start and stop based on tank pressure change according to claim 1, characterized in that: The interlock parking system includes a lubricating oil pressure sensor, a first-stage intake pressure sensor, a first-stage exhaust temperature sensor, a second-stage exhaust temperature sensor, and a fuselage vibration sensor arranged on the compressor, and each sensor is electrically connected to the analysis and early warning module.

3. The compressor control system for automatic start and stop based on tank pressure change according to claim 1, characterized in that: The last return regulating valve and the main motor are both provided with a time delay switch.

4. The compressor control system for automatic start and stop based on tank pressure change according to claim 1, characterized in that: The compressor also includes an auxiliary oil pump, and the control module controls the opening and closing of the auxiliary oil pump.

5. A compressor control method based on automatic start and stop of storage tank pressure changes, applied to a compressor control system based on automatic start and stop of storage tank pressure changes as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Press the start button to start the startup procedure. If the oil supply temperature of the compressor oil station is ≥10°C, start the main oil pump to pump oil; Step 2: Open the last return regulating valve to 100%, open the cover side unloading solenoid valve and the shaft side unloading solenoid valve, open the process gas inlet valve, and open the process gas outlet valve; Step 3: When the last return regulating valve is open 100%, the main motor emergency stop button is not actuated, the process gas inlet valve is fully opened, the process gas outlet valve is fully opened, the process interlock signal is checked and there is no interlock, the oil supply pressure is ≥0.25MPa, and the oil supply temperature is ≥10℃, proceed to the next step; Step 4: Start the main motor, delay 5s, and transmit the main motor running signal to the control monitoring system, and the main motor start-up is completed; Step 5: After the main motor runs for 30 seconds, close the cover side unloading solenoid valve and the shaft side unloading solenoid valve; Step 6: Delay 15 seconds to close the last return regulating valve. If the return state is ≤5%, the compressor is started; Step 7. When the tank pressure is ≥5.31MPa, open the cover side unloading solenoid valve and the shaft side unloading solenoid valve, open the last return regulating valve to 100%, delay 15s to stop the main motor, transmit the main motor stop signal to the control system, close the process gas inlet valve, and close the process gas outlet valve; Step 8. Press the automatic start button to start the automatic start program. When the pressure transmitter detects that the process tank pressure is less than 3.5MPaG, it transmits the process tank pressure signal to the analysis and early warning module. After analysis by the analysis and early warning module, steps 2 to 7 are automatically performed through the control module.

6. The compressor control method for automatic start and stop based on tank pressure change according to claim 5, characterized in that: The startup procedure is equipped with a timer and an alarm. When the timing is started, if the startup is completed within 120 seconds, the timer is reset. If the startup is not completed within 120 seconds, an alarm is sounded.

7. The compressor control method for automatic start and stop based on tank pressure change according to claim 5, characterized in that: When the interlock parking system is in operation of the compressor, if the lubricating oil pressure is ≤0.15MPa or the first-stage intake pressure is ≤0.12MPa or the first-stage exhaust temperature is ≥112℃ or the second-stage exhaust temperature is ≥112℃ or the body vibration is ≥7.2mm / s, an alarm will be sounded and the main motor will be stopped. The cover side unloading solenoid valve and the shaft side unloading solenoid valve will be opened, the last return regulating valve will be opened to 100%, the process gas inlet valve will be closed, the process gas outlet valve will be closed, and the automatic start-up program will be cut off.

8. The compressor control method for automatic start and stop based on tank pressure change according to claim 5, characterized in that: When the compressor is running, press the emergency stop button to stop the main motor, close the process gas inlet valve, close the process gas outlet valve, and cut off the automatic start-up program.

9. The compressor control method for automatic start and stop based on tank pressure change according to claim 5, characterized in that: When the compressor is running, press the stop button on site to stop the main motor. The main motor stop signal is transmitted to the analysis and early warning module. After analysis, the control module opens the cover side unloading solenoid valve and the shaft side unloading solenoid valve, opens the last return regulating valve to 100%, closes the process gas inlet valve, closes the process gas outlet valve, and cuts off the automatic start-up program.

10. The compressor control method for automatic start and stop based on tank pressure change according to claim 5, characterized in that: When the oil supply pressure is ≤0.28MPa, the main oil pump and the auxiliary oil pump are automatically started at the same time, and when the oil supply pressure is ≥0.45MPa, an alarm is issued and the auxiliary oil pump is manually stopped.

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