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Oil pumps

Oil pump is the main energy consuming equipment in the oil depot. In actual operation, it is necessary to control the opening of the outlet valve of the oil pump according to the operating conditions to adjust the flow to meet the needs of production process. This flow regulation method produces a large pressure difference before and after the oil pump outlet valve, and a large energy waste.

By using the variable frequency drives, it can change the speed of oil pump to realize the flow regulation under different working conditions, reduce the consumption of the oil, save energy and optimize the process.
  • Abstract
  • Configurations
  • Applications

Oil pump is the main energy consuming equipment in the oil depot. In actual operation, it is necessary to control the opening of the outlet valve of the oil pump according to the operating conditions to adjust the flow to meet the needs of production process. This flow regulation method produces a large pressure difference before and after the oil pump outlet valve, and a large energy waste.

By using the variable frequency drives, it can change the speed of oil pump to realize the flow regulation under different working conditions, reduce the consumption of the oil, save energy and optimize the process.
 
 
 

According to the basic law of fluid mechanics, the pump equipment is a square torque load, and its speed N has the following relationship with the flow rate Q, head H and the shaft power P:

Flow Q1/Q2 =N1/N2
Head H1/H2 =(N1/N2)2
Shaft power P1/P2=(N1/N2)3
It can be seen from the above formula that the flow rate of the pump is proportional to its rotational speed, the pump head is proportional to the square of its rational speed, and the shaft power is proportional to the cube of its rotational speed.
When the flow rate is reduced by lowering the motor speed, the power saving effect is related to the cube of speed drop, and the power saving effect is very obvious.
As shown in the figure, the normal working point of the pump is A, when the flow needs to be adjusted from Q1 to Q2, the baffle adjustment is adopted, and the resistance of the pipeline increased and the pipe characteristic curve is changed from R1 to R2. The working point changed to B. The power is the area enclosed by O-Q2-B-H2. Compared with the former area O-Q1-A-H1, the power variation is small, but its efficiency reduced at the same time. So it is a method of energy consumption.
When using variable frequency drives, the motor speed can be raised and lowered as needed, and the flow rate can be reduced by reducing the motor speed. The adjustment changes the performance curve of the pump from N1 to N2. The working point adjusted to C to match the process requirements, and the flow rate is reduced to Q2, the power is the area enclosed by O-Q2-B-H3. At the same time, the efficiency curve also shifts. Pump is still working in the high efficiency zone to achieve energy saving effect. The shaded part of the figure is the actual energy savings.
 

 

 

Xinjiang Oilfield Bailian Station

Loading: Centrifugal oil pump 

Model：NC HVVF 6/6-400

Input Voltage：6kV

Output Voltage：6kV

Output capacity：400kW

 

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