The application of frequency conversion speed regulating device in the centrifuge drive system ![]()
Abstract: The frequency conversion transformation of the centrifuge drive system not only saves a lot of electric energy and equipment maintenance costs, but also improves the reliability of safe production and the level of production automation.
Keywords: frequency conversion technology; centrifuge; energy saving. An oil refinery, using frequency conversion speed regulation device to carry out frequency conversion transformation of a centrifuge drive system, has achieved ideal results. Not only does it save a lot of electricity and equipment maintenance costs, but also greatly improves the level of automation.
1 The production process and disadvantages of the centrifuge before transformation The centrifuge is a refining device for a product. A crude product produced after the polymerization reaction contains impurities such as ethanol moisture, etc., and must be dried and refined to become a finished product. In this way, the production process of the centrifuge is divided into three stages: cloth, homogenization and centrifugal spin-drying. The fabric needs 2 minutes, the motor rotation speed is 300 rpm; the homogenization is 1 minute, the motor rotation speed is 500 rpm; the centrifugal spin drying is 2 minutes, the rotation speed is 900-1000 rpm. Before the transformation, the operator observed the speed change with the naked eye, and realized the speed regulation by frequently starting and stopping the motor to meet the production requirements, resulting in a large current impact, severe burns of the motor and electrical components, poor speed regulation performance, and low product quality. Power consumption is severe.
2 Frequency conversion transformation plan In view of the above situation, decided to transform the centrifuge drive system frequency conversion.
2.1 Fuji inverter (FRENIC5000BG9-68Kw)
Fuji inverter is a high-reliability product manufactured by comprehensive modern technology. The main features are as follows: (1) The switching element adopts GTO, which improves the reliability of the inverter. (2) Adopt pulse width modulation to make the equivalent waveform close to sine wave, reduce the higher harmonic components and improve the output voltage quality. (3) Fuji inverter BG9 / BP9 series adopts dual CPU control, which greatly improves the inverter control performance, the protection function is more perfect, and the operation is simpler and more reliable.
2.2 Reconstruction plan The device has four centrifuges, 1 #. 2 # is a group, corresponding to one reactor, 3 # and 4 # are a group, corresponding to another reactor. There are two centrifuges in each group, one is working normally and the other is spare. Under normal circumstances, only one can be used to meet the production. When the output of the product is relatively large, only one can be opened in each group to work at the same time. According to the production characteristics, the determination scheme is as follows: (1) Every two centrifuges share an inverter, and a double-throw double-throw isolation switch is installed at the output end of the inverter to switch. 1 # and 2 # share one inverter; 3 # and 4 # share one inverter. This can save money and increase the utilization rate of the inverter. (2) In order to prevent the inverter from affecting production, a contactor is installed at the front of the inverter, so that the inverter can be bypassed for maintenance without affecting production. (3) According to the characteristics of the centrifuge with large rotational inertia, it is decided to choose the G9 series inverter. Since the maximum drag motor is 45Kw, considering that there is a certain margin, the 68Kw inverter is selected. (4) According to the process requirements, the function curve of the inverter is set according to the performance of the centrifuge. The inverter is set to a multi-stage variable speed control scheme. The initial synchronous speed of the fabric is 300 rpm / min; 500 rpm / Points; thrown at the time is set at 1000 rpm. (5) Due to the explosion-proof requirements on site, the inverter is installed in the power distribution room, and the load motor is provided with an adjustable frequency power supply through the output cable. Only the explosion-proof control button is installed next to the centrifuge to achieve start, stop and grade adjustment The speed function and other display functions are all installed on the console, which is installed in the power distribution room. (6) In order to improve productivity and shorten the time of each stop, the inverter adds energy-consuming braking equipment. (7) Frequency converter switch, energy consumption external device, frequency converter output VI contactor are installed in the console, various indicators and remote operating systems are installed on the console table (8) Peripheral control is considered Automation and further improve the control level in order to network with the computer, add a PLC program controller outside the inverter, the PLC adjusts the speed of each stage, and has an extended function interface.
Keywords: frequency conversion technology; centrifuge; energy saving. An oil refinery, using frequency conversion speed regulation device to carry out frequency conversion transformation of a centrifuge drive system, has achieved ideal results. Not only does it save a lot of electricity and equipment maintenance costs, but also greatly improves the level of automation.
1 The production process and disadvantages of the centrifuge before transformation The centrifuge is a refining device for a product. A crude product produced after the polymerization reaction contains impurities such as ethanol moisture, etc., and must be dried and refined to become a finished product. In this way, the production process of the centrifuge is divided into three stages: cloth, homogenization and centrifugal spin-drying. The fabric needs 2 minutes, the motor rotation speed is 300 rpm; the homogenization is 1 minute, the motor rotation speed is 500 rpm; the centrifugal spin drying is 2 minutes, the rotation speed is 900-1000 rpm. Before the transformation, the operator observed the speed change with the naked eye, and realized the speed regulation by frequently starting and stopping the motor to meet the production requirements, resulting in a large current impact, severe burns of the motor and electrical components, poor speed regulation performance, and low product quality. Power consumption is severe.
2 Frequency conversion transformation plan In view of the above situation, decided to transform the centrifuge drive system frequency conversion.
2.1 Fuji inverter (FRENIC5000BG9-68Kw)
Fuji inverter is a high-reliability product manufactured by comprehensive modern technology. The main features are as follows: (1) The switching element adopts GTO, which improves the reliability of the inverter. (2) Adopt pulse width modulation to make the equivalent waveform close to sine wave, reduce the higher harmonic components and improve the output voltage quality. (3) Fuji inverter BG9 / BP9 series adopts dual CPU control, which greatly improves the inverter control performance, the protection function is more perfect, and the operation is simpler and more reliable.
2.2 Reconstruction plan The device has four centrifuges, 1 #. 2 # is a group, corresponding to one reactor, 3 # and 4 # are a group, corresponding to another reactor. There are two centrifuges in each group, one is working normally and the other is spare. Under normal circumstances, only one can be used to meet the production. When the output of the product is relatively large, only one can be opened in each group to work at the same time. According to the production characteristics, the determination scheme is as follows: (1) Every two centrifuges share an inverter, and a double-throw double-throw isolation switch is installed at the output end of the inverter to switch. 1 # and 2 # share one inverter; 3 # and 4 # share one inverter. This can save money and increase the utilization rate of the inverter. (2) In order to prevent the inverter from affecting production, a contactor is installed at the front of the inverter, so that the inverter can be bypassed for maintenance without affecting production. (3) According to the characteristics of the centrifuge with large rotational inertia, it is decided to choose the G9 series inverter. Since the maximum drag motor is 45Kw, considering that there is a certain margin, the 68Kw inverter is selected. (4) According to the process requirements, the function curve of the inverter is set according to the performance of the centrifuge. The inverter is set to a multi-stage variable speed control scheme. The initial synchronous speed of the fabric is 300 rpm / min; 500 rpm / Points; thrown at the time is set at 1000 rpm. (5) Due to the explosion-proof requirements on site, the inverter is installed in the power distribution room, and the load motor is provided with an adjustable frequency power supply through the output cable. Only the explosion-proof control button is installed next to the centrifuge to achieve start, stop and grade adjustment The speed function and other display functions are all installed on the console, which is installed in the power distribution room. (6) In order to improve productivity and shorten the time of each stop, the inverter adds energy-consuming braking equipment. (7) Frequency converter switch, energy consumption external device, frequency converter output VI contactor are installed in the console, various indicators and remote operating systems are installed on the console table (8) Peripheral control is considered Automation and further improve the control level in order to network with the computer, add a PLC program controller outside the inverter, the PLC adjusts the speed of each stage, and has an extended function interface.
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