Process screw compressor control system

Abstract

The utility model relates to process screw compressor technical field, concretely is process screw compressor control system, including execution module, power module, control module, detection module, detection module and auxiliary module, the execution module is used for through valve spare and pipeline joint, realizes the on-off of pipe network gas into compressor and the regulation of intake volume, the one-way delivery of compressed gas prevents backflow, system overpressure pressure relief protection, the backflow direction of excess gas when unit load reduction, the venting pressure relief of gas when unit shutdown. The utility model greatly reduces high -power motor starting impact, through the light -load starting design of the delay opening of the air intake compensation air solenoid valve first into a small amount of pipe network gas, air inlet control valve, makes main motor with light -load state starts, avoids the situation that the starting load is too high along with the air inlet pressure, protects the pipe network system from strong impact, improves system starting stability, adapts the safe starting demand of high -power motor drive compressor in petroleum, chemical industry, coal mine and so on industry.

Description

Technical Field

[0001] This utility model relates to the field of process screw compressor technology, specifically to a process screw compressor control system. Background Technology

[0002] With the development of industrial technology, various resources are being effectively recycled and reused. Common examples include the recovery and reuse of gases such as oilfield flue gas, associated oilfield gas, coalbed methane, and biogas. These gases are often stored under slightly positive pressure (below 3 bar) and require compressors to compress them to a certain pressure before being delivered to the gas field. Process screw compressors are widely used in industries such as petroleum, chemical, and coal mining.

[0003] Generally, starting large motors with a power of 160kW or more presents significant technical challenges. The starting method often adopts frequency conversion starting. With the accompanying air pressure, the main motor has a heavy starting load, which has a great impact on the entire gas pipeline system. When the gas fluctuates at the downstream end, it is often unloaded. Currently, most of the venting is done to the air defense pipeline network.

[0004] Based on this, the present invention provides a process screw compressor control system to solve the aforementioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a process screw compressor control system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model proposes a process screw compressor control system, including an execution module, a power module, a control module, a detection module, and an auxiliary module; The execution module is used to control the flow of gas from the pipeline into the compressor and regulate the intake volume, unidirectional delivery of compressed gas to prevent backflow, overpressure relief protection of the system, guide the return of excess gas when the unit is unloaded, and vent and depressurize gas when the unit is shut down, all through valves and pipe joints. The power module is used to drive the compressor through the main motor and coupling, providing the core power for gas compression and enabling frequency increase and decrease regulation. The control module receives transmitted pressure and temperature signals, issues frequency increase, frequency decrease, start, and stop commands according to preset parameters, and sends open and close commands to the valves of the execution module. The detection module collects pressure data in real time from key nodes of the compressor outlet pipeline, oil separator, and return pipeline, and converts the collected pressure and temperature data into electrical signals to generate control commands and provide data basis. The auxiliary module filters impurities in the gas entering the compressor to prevent impurities from damaging the internal components of the compressor.

[0007] Preferably, the execution module includes: A 20t 0.6-0.8MPa PN16 pneumatic valve is installed at the connection node between the compressor's front-end intake pipe and the pipeline network. The valve body has a nominal pressure of PN16, a rated flow rate of 20t, and a working pressure range of 0.6-0.8MPa. It is used to control the flow of gas from the pipeline network into the front end of the compressor, and to regulate the compressor's intake volume by opening or closing the valve. The 24V YV4 ϕ6×1 check valve is installed in the pipeline between the compressor and the oil separator. Its working voltage is 24V and the interface specification is ϕ6×1. It is used to prevent the lubricating oil or gas inside the oil separator from flowing back into the compressor, ensuring unidirectional fluid flow and avoiding reverse fluid impact on the internal components of the compressor. The 24V NPT1 / 2 check valve is installed in the return pipeline between the YV3 solenoid valve and the front end of the compressor. The working voltage is 24V and the interface specification is NPT1 / 2. It is used to prevent the gas at the front end of the compressor from flowing back into the return pipeline and to ensure that the return gas only enters the front end of the compressor in one direction. The Y E78 PN63 DN50 safety valve is installed in the pressure relief line at the top of the oil separator. It has a nominal pressure of PN63, a nominal diameter of DN50, and a model of Y E78. When the internal pressure of the oil separator exceeds the preset safety threshold, it automatically opens to relieve pressure, preventing the oil separator from being damaged due to overpressure and ensuring the safety of system pressure. The 24V ZDYV2 vent valve is installed in the venting pipeline between the compressor and the pipeline network. It operates at 24V and is used to vent some of the gas in the system to the pipeline network during unit shutdown, thereby helping the system pressure to drop to zero quickly. The intake solenoid valve is installed on the intake branch line between the pipeline network and the compressor front end. It is used to open after receiving the control module command when the unit starts under light load, so that a small amount of pipeline gas enters the compressor front end to establish the initial operating pressure of the compressor. The YV3 solenoid valve is installed on the return pipe between the compressor outlet pipe and the front-end inlet pipe. It is used to open when the unit is unloaded, so that excess gas at the compressor outlet flows back to the front-end inlet to realize gas recovery and reuse. It is closed when the unit is loaded to cut off the return channel. The YV2 solenoid valve is installed at the connection point between the compressor outlet pipeline and the vent pipeline. It is used to open when the unit is shut down. In conjunction with the ZDYV2 vent valve, it releases part of the gas in the system into the pipeline network, accelerating the depressurization of the system. The DN65 minimum pressure valve is installed on the main gas supply pipeline between the oil separator outlet and the pipeline network. The nominal diameter is DN65. It is used to ensure that the compressor system always maintains the minimum working pressure, prevent gas from the pipeline network from flowing back into the system, and ensure the normal circulation of lubricating oil. The DN15 PN63 pipe fitting is distributed in the air inlet / recharge branch pipe, return pipe and vent pipe. It has a nominal diameter of DN15 and a nominal pressure of PN63. It is used to connect the various pipes to ensure the pipes are sealed and prevent gas leakage.

[0008] Preferably, the power module includes: The main motor, which is connected to the compressor via a coupling, has a rated power of not less than 160kW. It is used to drive the compressor through the coupling under the drive of the frequency conversion control unit, providing the core power for gas compression, and can realize frequency increase and frequency decrease adjustment. A 60t 2.5-3.5MPa motor is installed in the drive circuit of the auxiliary module. The rated flow rate is 60t, and the working pressure range is 2.5-3.5MPa. It is used to provide operating power for the auxiliary modules of filter and lubricating oil heater to ensure the stable operation of the auxiliary modules. A coupling that connects the output shaft of the main motor to the input shaft of the compressor is used to transmit the torque of the main motor to the compressor, ensuring that the speeds of the main motor and the compressor are synchronized, and reducing vibration and impact during transmission. The compressor is located at the core of the system. Its input end is connected to the air intake pipe, and its output end is connected to the oil separator. It is used to receive power transmitted by the main motor, compress the gas entering the pipeline, and increase the gas pressure to a pressure value that meets the pipeline transportation requirements.

[0009] Preferably, the control module includes: The variable frequency control unit is electrically connected to the main motor, the 60t 2.5-3.5MPa motor, the air intake solenoid valve, the YV3 solenoid valve, the YV2 solenoid valve, the 20t 0.6-0.8MPa PN16 pneumatic valve and the pressure detection unit, and the temperature exchanger in the 315kW unit. It is used to receive signals transmitted by the detection module, issue control commands according to the preset program, adjust the motor speed, control the opening and closing of each solenoid valve and pneumatic valve, and realize the system's light load start-up, loading and unloading and shutdown control. The M101 motor power supply monitoring module is electrically connected to the power supply circuit of the main motor and the 60t 2.5-3.5MPa motor. It is used to detect the voltage and current parameters of the motor power supply circuit. When the circuit parameters are abnormal, an alarm signal is sent to the frequency converter control unit to ensure the safety of motor power supply.

[0010] Preferably, the detection module includes: The pressure detection unit is installed in the compressor outlet pipeline, inside the oil separator and return pipeline, and is electrically connected to the frequency converter control unit. It is used to collect pressure data of each key node of the system in real time, convert the pressure data into electrical signals and transmit them to the frequency converter control unit to provide pressure control basis for the frequency converter control unit. The 315kW unit internal temperature switch is installed in the heat dissipation circuit of the compressor, main motor and oil separator, and is electrically connected to the frequency converter control unit. It is used to collect the temperature data of each core component inside the unit in real time, convert the temperature data into electrical signals and transmit them to the frequency converter control unit. When the temperature exceeds the preset threshold, it triggers the frequency converter control unit to adjust the motor speed or start the heat dissipation device.

[0011] Preferably, the auxiliary module includes: The filter is installed on the main intake line at the front end of the pipeline and the compressor. It has a working voltage of 380V and a rated power of 5kW. It is used to filter impurities in the gas entering the front end of the compressor, prevent impurities from wearing the internal parts of the compressor, and ensure the cleanliness of the compressed gas. A DN125 lubricating oil heater is installed in the lubricating oil circuit at the bottom of the oil separator. The nominal diameter is DN125. It is used to heat the lubricating oil inside the oil separator to maintain the lubricating oil at a suitable working temperature and ensure the fluidity and lubrication performance of the lubricating oil. The oil separator tank heat tracing cable is wrapped around the outer wall of the oil separator tank to provide heat tracing and insulation for the oil separator tank, prevent the lubricating oil inside the oil separator from solidifying due to low ambient temperature, and ensure the normal circulation of the lubricating oil. An oil-gas separator is connected between the compressor output end and the DN65 minimum pressure valve. It is used to separate the oil-gas mixture discharged from the compressor, return the separated lubricating oil to the compressor lubrication circuit, and deliver the separated gas to the DN65 minimum pressure valve. A 1.5kW 240V fan is installed in the heat dissipation channel of the unit. The rated power is 1.5kW and the working voltage is 240V. It is electrically connected to the frequency converter control unit and is used to receive the command of the frequency converter control unit to start when the unit temperature is too high, so as to accelerate the heat dissipation inside the unit. A 300W M380V 5.5kW 50Hz switch is installed in the system power supply circuit. It has a rated power of 300W, an operating voltage of 380V, a rated power of 5.5kW, and an operating frequency of 50Hz. It is used to stabilize the system power supply voltage and frequency and provide a stable power supply loop for each module.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention significantly reduces the starting impact of high-power motors. Through a light-load starting design using an intake solenoid valve to first introduce a small amount of pipeline gas and a delayed opening of the intake control valve, the main motor starts under light load, avoiding excessive starting load when accompanied by intake pressure. This protects the pipeline system from strong impacts, improves system starting stability, and is suitable for the safe starting requirements of high-power motor-driven compressors in industries such as petroleum, chemical, and coal mining. It also achieves efficient utilization of gas resources. For unit loading and unloading conditions caused by fluctuations in downstream gas consumption, a load reduction and return loop is constructed using a YV3 solenoid valve, allowing excess gas to flow back to the compressor front end during unloading instead of being vented, preventing resource waste and improving the utilization rate of recovered gases such as oilfield flue gas, associated gas, coalbed methane, and biogas. This ensures system reliability and automation, and the entire control process requires no manual intervention, automatically completing light-load starting, loading and unloading adjustment, and shutdown protection. It is suitable for micro-positive pressure gas compression and transportation needs, providing support for the stable application of process screw compressors in the field of resource recycling. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the process screw compressor control system of this utility model. Detailed Implementation

[0014] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0015] Please see Figure 1 This utility model proposes a process screw compressor control system, including an execution module, a power module, a control module, a detection module, a detection module, and an auxiliary module; The execution module is used to realize the opening and closing of pipeline gas entering the compressor and the regulation of the intake volume through valves and pipeline joints, the one-way delivery of compressed gas to prevent backflow, the overpressure relief protection of the system, the return flow guidance of excess gas when the unit is unloaded, and the venting and depressurization of gas when the unit is shut down. The power module is used to drive the compressor through the main motor and coupling, providing the core power for gas compression and realizing frequency increase and decrease regulation; The control module is used to receive transmitted pressure and temperature signals, issue frequency increase, frequency decrease, start, and stop commands according to preset parameters, and issue open and close commands to each valve of the actuator module. The detection module is used to collect pressure data in real time from key nodes of the compressor outlet pipeline, oil separator, and return pipeline, and convert the collected pressure and temperature data into electrical signals to generate control commands and provide data basis. The auxiliary module is used to filter impurities in the gas entering the compressor through a filter, preventing impurities from wearing down the internal components of the compressor.

[0016] It should also be noted that the execution module includes: The 20t 0.6-0.8MPa PN16 pneumatic valve is installed at the connection point between the compressor's front-end intake pipeline and the pipeline network. Its nominal valve body pressure is PN16, the rated flow rate is 20t, and the working pressure range is 0.6-0.8MPa. It is used to control the on / off of pipeline gas entering the front end of the compressor, and the compressor intake volume is adjusted by opening or closing it. The 24V YV4 ϕ6×1 check valve is installed in the pipeline between the compressor and the oil separator. Its working voltage is 24V and the interface specification is ϕ6×1. It is used to prevent the lubricating oil or gas inside the oil separator from flowing back into the compressor, ensuring unidirectional fluid flow and avoiding reverse fluid impact on the internal components of the compressor. The 24V NPT1 / 2 check valve is installed in the return line between the YV3 solenoid valve and the front end of the compressor. The working voltage is 24V and the interface specification is NPT1 / 2. It is used to prevent the gas at the front end of the compressor from flowing back into the return line and to ensure that the return gas only enters the front end of the compressor in one direction. The Y E78 PN63 DN50 safety valve is installed in the pressure relief line at the top of the oil separator. It has a nominal pressure of PN63, a nominal diameter of DN50, and a model number of Y E78. When the internal pressure of the oil separator exceeds the preset safety threshold, it will automatically open to relieve pressure, preventing the oil separator from being damaged due to overpressure and ensuring the safety of the system pressure. The 24V ZDYV2 vent valve is installed in the venting line between the compressor and the pipeline network. It operates at 24V and is used to release some of the gas in the system into the pipeline network during unit shutdown, thereby helping the system pressure to drop to zero quickly. The intake solenoid valve is installed on the intake branch line between the pipeline network and the compressor front end. It is used to open when the unit starts under light load after receiving the command from the control module, so that a small amount of pipeline gas enters the compressor front end to establish the initial operating pressure of the compressor. The YV3 solenoid valve is installed on the return line between the compressor outlet line and the front inlet line. It is used to open when the unit is unloaded, so that the excess gas at the compressor outlet flows back to the front inlet to realize gas recovery and reuse. It is closed when the unit is loaded to cut off the return channel. The YV2 solenoid valve is installed at the connection point between the compressor outlet pipeline and the vent pipeline. It is used to open when the unit is shut down. In conjunction with the ZDYV2 vent valve, it releases part of the gas in the system into the pipeline network, accelerating the depressurization of the system. The DN65 minimum pressure valve is installed on the main gas supply line between the oil separator outlet and the pipeline network. It has a nominal diameter of DN65 and is used to ensure that the compressor system always maintains the minimum working pressure, prevent gas from the pipeline network from flowing back into the system, and ensure the normal circulation of lubricating oil. DN15 PN63 pipe fittings are used in intake and replenishment branch pipes, return pipes, and vent pipes. The nominal diameter is DN15 and the nominal pressure is PN63. They are used to connect various pipes to ensure pipe sealing and prevent gas leakage.

[0017] It should also be noted that the power module includes: The main motor is connected to the compressor via a coupling. Its rated power is not less than 160kW. It is used to drive the compressor through the coupling under the drive of the frequency conversion control unit, providing the core power for gas compression. It can realize frequency increase and frequency decrease adjustment. A 60t 2.5-3.5MPa motor is installed in the drive circuit of the auxiliary module. The rated flow rate is 60t, and the working pressure range is 2.5-3.5MPa. It is used to provide operating power for the auxiliary modules of filter and lubricating oil heater to ensure the stable operation of the auxiliary modules. The coupling connects the output shaft of the main motor and the input shaft of the compressor. It is used to transmit the torque of the main motor to the compressor, ensuring that the speeds of the main motor and the compressor are synchronized, and reducing vibration and impact during the transmission process. The compressor is located at the core of the system. Its input end is connected to the air intake pipe, and its output end is connected to the oil separator. It is used to receive power transmitted from the main motor, compress the gas entering the pipeline, and increase the gas pressure to the pressure value that meets the pipeline transportation requirements.

[0018] It should also be noted that the control module includes: The frequency converter control unit is electrically connected to the main motor, the 60t 2.5-3.5MPa motor, the air intake solenoid valve, the YV3 solenoid valve, the YV2 solenoid valve, the 20t 0.6-0.8MPa PN16 pneumatic valve and pressure detection unit, and the temperature exchanger in the 315kW unit. It is used to receive signals transmitted by the detection module, issue control commands according to the preset program, adjust the motor speed, control the opening and closing of each solenoid valve and pneumatic valve, and realize the system's light load start-up, loading and unloading and shutdown control. The M101 motor power supply monitoring module is electrically connected to the power supply circuit of the main motor and the 60t 2.5-3.5MPa motor. It is used to detect the voltage and current parameters of the motor power supply circuit. When the circuit parameters are abnormal, an alarm signal is sent to the frequency converter control unit to ensure the safety of motor power supply.

[0019] It should also be noted that the detection module includes: The pressure detection unit is installed in the compressor outlet pipeline, inside the oil separator and return pipeline. It is electrically connected to the frequency converter control unit and is used to collect pressure data of each key node of the system in real time. The pressure data is converted into electrical signals and transmitted to the frequency converter control unit to provide pressure control basis for the frequency converter control unit. The 315kW unit internal temperature switch is installed in the heat dissipation circuit of the compressor, main motor and oil separator, and is electrically connected to the frequency converter control unit. It is used to collect the temperature data of each core component inside the unit in real time, convert the temperature data into electrical signals and transmit them to the frequency converter control unit. When the temperature exceeds the preset threshold, it triggers the frequency converter control unit to adjust the motor speed or start the heat dissipation device.

[0020] It should also be noted that the auxiliary module includes: The filter is installed on the main intake line at the front end of the pipeline and compressor. The working voltage is 380V and the rated power is 5kW. It is used to filter impurities in the gas entering the front end of the compressor, prevent impurities from wearing the internal parts of the compressor, and ensure the cleanliness of the compressed gas. The DN125 lubricating oil heater is installed in the lubricating oil circuit at the bottom of the oil separator. It has a nominal diameter of DN125 and is used to heat the lubricating oil inside the oil separator to maintain the lubricating oil at a suitable working temperature and ensure the fluidity and lubrication performance of the lubricating oil. The oil separator tank heat tracing cable is wrapped around the outer wall of the oil separator tank to provide heat tracing and insulation, prevent the lubricating oil inside the oil separator from solidifying due to low ambient temperature, and ensure the normal circulation of the lubricating oil. An oil-gas separator is connected between the compressor output end and the DN65 minimum pressure valve. It is used to separate the oil-gas mixture discharged from the compressor, return the separated lubricating oil to the compressor lubrication circuit, and deliver the separated gas to the DN65 minimum pressure valve. A 1.5kW 240V fan is installed inside the unit's heat dissipation channel. The rated power is 1.5kW and the working voltage is 240V. It is electrically connected to the frequency converter control unit and is used to receive the command from the frequency converter control unit to start when the unit temperature is too high, so as to accelerate the dissipation of heat inside the unit. The 300W M380V 5.5kW 50Hz switch is installed in the system power supply circuit. It has a rated power of 300W, an operating voltage of 380V, a rated power of 5.5kW, and an operating frequency of 50Hz. It is used to stabilize the system power supply voltage and frequency and provide a stable power supply loop for each module.

[0021] In a specific implementation, during practical application, after the system start command is triggered, the frequency converter control unit first sends an opening command to the intake solenoid valve and simultaneously sends a delayed closing command to the 20t 0.6-0.8MPa PN16 pneumatic valve. After the intake solenoid valve opens, the pipeline gas, after passing through the DN15 PN63 pipe joint and filter, enters the compressor front end in a small amount. The frequency converter control unit sends a start command to the main motor, which starts at a low frequency under the drive of the frequency converter control unit. The main motor drives the compressor to run at low speed through the coupling. At this time, the compressor is in a light-load operation state because only a small amount of gas is introduced at the front end, avoiding excessive starting load. The pressure detection unit collects the pressure data of the compressor outlet pipeline in real time and transmits the pressure signal to the frequency converter control unit. When the frequency converter control unit determines that the pressure has reached the system's preset "pressure build-up threshold", it sends a delayed closing command to the 20t 0.6-0.8MPa PN16 pneumatic valve. When the pneumatic valve issues an opening command, the intake control valve opens, allowing gas from the pipeline to enter the compressor normally. Simultaneously, the frequency converter control unit increases the frequency of the main motor to its rated speed, and the compressor enters a stable operating state, delivering compressed gas to the oil separator. The oil separator separates the oil-gas mixture. The separated lubricating oil, after being heated by the DN125 lubricating oil heater, flows back to the compressor lubrication circuit. The separated gas, after being stabilized by the DN65 minimum pressure valve, is delivered to the pipeline. When the gas consumption in the downstream pipeline increases, the pressure detection unit detects that the pipeline pressure is below the "load pressure threshold" and transmits the pressure signal to the frequency converter control unit. The frequency converter control unit issues a closing command to the YV3 solenoid valve and an opening command to the 20t 0.6-0.8MPa PN16 pneumatic valve, fully opening the intake control valve and increasing the compressor's intake volume. The frequency converter control unit then issues a frequency increase command to the main motor, increasing the main motor speed and the compressor's output power, compressing more gas for delivery through the oil separator and DN65. The minimum pressure valve delivers gas to the pipeline network until the pressure detection unit detects that the pipeline network pressure has reached the "rated pressure threshold". The frequency converter control unit controls the main motor to maintain the current speed, and the unit supplies gas stably. When the gas consumption of the downstream pipeline network decreases, the pressure detection unit collects the pipeline network pressure, which is higher than the "load reduction pressure threshold". The pressure signal is transmitted to the frequency converter control unit, which sends a closing command to the 20t 0.6-0.8MPaPN16 pneumatic valve and an opening command to the YV3 solenoid valve to cut off the compressor intake channel. The frequency converter control unit sends a frequency reduction command to the main motor, and the main motor speed decreases. Excess compressed gas at the compressor outlet flows back to the compressor front inlet through the YV3 solenoid valve, the 24V NPT1 / 2 check valve, and the DN15 PN63 pipeline joint until the pressure detection unit detects that the pipeline network pressure has dropped to the "load pressure threshold". The frequency converter control unit repeats the load linkage steps, and the unit resumes normal gas supply. After the shutdown command is triggered, the frequency converter control unit first sends gas to the 20t 0.6-0.8MPaPN16 pneumatic valve.The 8MPa PN16 pneumatic valve sends a closing command to cut off the compressor's air intake. Simultaneously, it sends opening commands to the YV3 and YV2 solenoid valves and the 24V ZDYV2 vent valve. A portion of the residual compressed gas inside the compressor flows back to the front inlet via the YV3 solenoid valve, while the remaining gas is vented to the pipeline network via the YV2 solenoid valve and the 24V ZDYV2 vent valve. The pressure detection unit collects system pressure data in real time and transmits the pressure signal to the frequency converter control unit. When the frequency converter control unit determines that the pressure value transmitted by the pressure detection unit has dropped to 0MPa, it sends closing commands to the YV3, YV2, and 24V ZDYV2 solenoid valves and simultaneously sends a stop command to the main motor. After the main motor stops running, the frequency converter control unit enters standby mode, completing the shutdown process.

[0022] In the description of this specification, the references to "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and effects.

Claims

1. A process screw compressor control system, characterized in that, It includes an execution module, a power module, a control module, a detection module, a testing module, and an auxiliary module; The execution module is used to control the flow of gas from the pipeline into the compressor and regulate the intake volume, unidirectional delivery of compressed gas to prevent backflow, overpressure relief protection of the system, guide the return of excess gas when the unit is unloaded, and vent and depressurize gas when the unit is shut down, all through valves and pipe joints. The power module is used to drive the compressor through the main motor and coupling, providing the core power for gas compression and enabling frequency increase and decrease regulation. The control module receives transmitted pressure and temperature signals, issues frequency increase, frequency decrease, start, and stop commands according to preset parameters, and sends open and close commands to the valves of the execution module. The detection module collects pressure data in real time from key nodes of the compressor outlet pipeline, oil separator, and return pipeline, and converts the collected pressure and temperature data into electrical signals to generate control commands and provide data basis. The auxiliary module filters impurities in the gas entering the compressor to prevent impurities from damaging the internal components of the compressor.

2. The process screw compressor control system according to claim 1, characterized in that, The execution module includes: A 20t 0.6-0.8MPa PN16 pneumatic valve is installed at the connection node between the compressor's front-end intake pipe and the pipeline network. The valve body has a nominal pressure of PN16, a rated flow rate of 20t, and a working pressure range of 0.6-0.8MPa. It is used to control the flow of gas from the pipeline network into the front end of the compressor, and to regulate the compressor's intake volume by opening or closing the valve. The 24V YV4 ϕ6×1 check valve is installed in the pipeline between the compressor and the oil separator. Its working voltage is 24V and the interface specification is ϕ6×1. It is used to prevent the lubricating oil or gas inside the oil separator from flowing back into the compressor. The 24V NPT1 / 2 check valve is installed in the return line between the YV3 solenoid valve and the front end of the compressor. The working voltage is 24V and the interface specification is NPT1 / 2. It is used to prevent the gas at the front end of the compressor from flowing back into the return line. The Y E78 PN63 DN50 safety valve is installed in the pressure relief pipeline at the top of the oil separator. It has a nominal pressure of PN63, a nominal diameter of DN50, and a model of Y E78. When the internal pressure of the oil separator exceeds the preset safety threshold, it will automatically open to relieve pressure. The 24V ZDYV2 vent valve is installed in the venting pipeline between the compressor and the pipeline network. It operates at 24V and is used to vent some of the gas in the system to the pipeline network during unit shutdown, thereby helping the system pressure to drop to zero quickly. The intake solenoid valve is installed on the intake branch line between the pipeline network and the compressor front end. It is used to open after receiving the control module command when the unit starts under light load, so that a small amount of pipeline gas enters the compressor front end to establish the initial operating pressure of the compressor. The YV3 solenoid valve is installed on the return pipe between the compressor outlet pipe and the front-end inlet pipe. It is used to open when the unit is unloaded, so that excess gas at the compressor outlet flows back to the front-end inlet. YV2 solenoid valve, which is installed at the connection node between the compressor outlet pipeline and the vent pipeline, is used to open when the unit is stopped, and works with ZDYV2 vent valve to release part of the gas in the system to the pipeline network; A DN65 minimum pressure valve is installed on the main gas supply pipeline between the oil separator outlet and the pipeline network, with a nominal diameter of DN65. DN15 PN63 pipe fittings are distributed in the air intake and replenishment branch pipes, return pipes and vent pipes. The nominal diameter is DN15 and the nominal pressure is PN63. They are used to connect various pipes.

3. The process screw compressor control system according to claim 2, characterized in that, The power module includes: The main motor, which is connected to the compressor via a coupling, has a rated power of not less than 160kW and is used to drive the compressor to operate via the coupling under the drive of the frequency converter control unit. A 60t 2.5-3.5MPa motor is installed in the drive circuit of the auxiliary module. The rated flow rate is 60t, and the working pressure range is 2.5-3.5MPa. It is used to provide operating power for the auxiliary modules of filter and lubricating oil heater. A coupling that connects the output shaft of the main motor to the input shaft of the compressor, used to transmit the torque of the main motor to the compressor; The compressor is located at the core of the system. Its input end is connected to the air intake pipe, and its output end is connected to the oil separator. It is used to receive power transmitted by the main motor, compress the gas entering the pipeline, and increase the gas pressure to a pressure value that meets the pipeline transportation requirements.

4. The process screw compressor control system according to claim 3, characterized in that, The control module includes: The variable frequency control unit is electrically connected to the main motor, the 60t 2.5-3.5MPa motor, the air intake solenoid valve, the YV3 solenoid valve, the YV2 solenoid valve, the 20t 0.6-0.8MPa PN16 pneumatic valve and the pressure detection unit, and the temperature exchanger in the 315kW unit. It is used to receive signals transmitted by the detection module, issue control commands according to the preset program, adjust the motor speed, and control the opening and closing of each solenoid valve and pneumatic valve. The M101 motor power supply monitoring module is electrically connected to the power supply circuit of the main motor and the 60t 2.5-3.5MPa motor. It is used to detect the voltage and current parameters of the motor power supply circuit and send an alarm signal to the frequency converter control unit when the circuit parameters are abnormal.

5. The process screw compressor control system according to claim 4, characterized in that, The detection module includes: The pressure detection unit is installed in the compressor outlet pipeline, inside the oil separator and return pipeline, and is electrically connected to the frequency converter control unit. It is used to collect pressure data of each key node of the system in real time, convert the pressure data into electrical signals and transmit them to the frequency converter control unit to provide pressure control basis for the frequency converter control unit. The 315kW unit internal temperature switch is installed in the heat dissipation circuit of the compressor, main motor and oil separator, and is electrically connected to the frequency converter control unit. It is used to collect the temperature data of each core component inside the unit in real time, convert the temperature data into electrical signals and transmit them to the frequency converter control unit. When the temperature exceeds the preset threshold, it triggers the frequency converter control unit to adjust the motor speed or start the heat dissipation device.

6. The process screw compressor control system according to claim 5, characterized in that, The auxiliary module includes: The filter is installed on the main intake line at the front end of the pipeline and the compressor. It operates at 380V and has a rated power of 5kW. It is used to filter impurities in the gas entering the front end of the compressor and prevent impurities from wearing the internal components of the compressor. A DN125 lubricating oil heater is installed in the lubricating oil circuit at the bottom of the oil separator. The nominal diameter is DN125. It is used to heat the lubricating oil inside the oil separator and keep the lubricating oil at a suitable working temperature. The oil separator tank heat tracing cable is wrapped around the outer wall of the oil separator tank to provide heat tracing and insulation for the oil separator tank and prevent the lubricating oil inside the oil separator from solidifying due to low ambient temperature. An oil-gas separator is connected between the compressor output end and the DN65 minimum pressure valve. It is used to separate the oil-gas mixture discharged from the compressor, return the separated lubricating oil to the compressor lubrication circuit, and deliver the separated gas to the DN65 minimum pressure valve. A 1.5kW 240V fan is installed in the unit's heat dissipation channel. The rated power is 1.5kW, the operating voltage is 240V, and it is electrically connected to the frequency converter control unit. It is used to start the fan when the unit temperature is too high by receiving a command from the frequency converter control unit. A 300W M380V 5.5kW 50Hz switch is installed in the system power supply circuit. It has a rated power of 300W, an operating voltage of 380V, a rated power of 5.5kW, and an operating frequency of 50Hz. It is used to stabilize the system power supply voltage and frequency.

Images