Solar Panel Cleaner Machine,Solar Plate Cleaning Machine,Panel Cleaning Machine,Solar Plate Washing Machine Taian Longye Import And Export Trade Co.,ltd , https://www.lydrillingrigfactory.com
Existing Control Flow Modes Under normal circumstances, oilfield high pressure water injection uses gate valve control to regulate flow and pressure. According to the process requirements, long-term small displacement operation is not allowed. Otherwise, the temperature inside the pump rises, causing problems such as cavitation and mechanical burning. In the past, it was forced to use a large reflow method to reduce the temperature rise, resulting in a large consumption of electricity, causing oil fields. A lot of energy loss.
In the original design system working conditions, two injection pumps were used for system water injection. In the case of no frequency conversion speed regulation, the energy loss of the water injection system of this working condition is mainly on the control valve throttling. Through analysis, only by combining the amount of mixing, reducing the water pressure, and reducing the valve control pressure difference of each injection well can achieve the purpose of energy saving.
The principle of the frequency conversion system indicates that the actual power flow rate of the water injection pump is smaller than the rated flow rate of the pump, so the power saving potential is large. The water injection control of the water injection pump in the system is the feedback pressure value of the inverter through the transmitter, and the pressure value pre-preset in the inverter is compared. The PID regulator in the inverter automatically performs the operation according to the difference to adjust the control frequency. At the same time, the operating parameters of the inverter are transmitted to the computer workstation through the internal computer interface and communication protocol; the system operating pressure, motor speed, input/output voltage, input/output current, etc. can be detected and controlled at any time on the computer. Parameters, to achieve the purpose of automatic energy-saving operation of the system.
Comparison of inverter system and original control system 1) Adopt frequency conversion control mode, which is easy to operate, no need to manually adjust the inlet valve, which greatly reduces the labor intensity of workers and improves work efficiency.
2) The starting noise is low. During the starting process, the motor accelerates slowly from the low frequency. After 20 seconds, the motor reaches the set frequency. Because the starting current is small, the impact on the power grid is reduced, the electrical equipment is protected, and the motor is extended. The service life increases the efficiency of the motor and saves maintenance costs.
3) The system adopts one-to-two control mode, and uses the pressure transmitter feedback current signal (4-20mA) to the inverter central processing unit (CPU) to form a closed-loop control system through PID control. The output frequency is controlled by the action processor to automatically increase or decrease the speed of the motor; when the pressure exceeds the set target value (> 5%), the first motor is turned to the power frequency, and the inverter starts. The two motors are operated in variable frequency to keep the water pressure constant. This not only reduces the reactive power of the motor, but also improves the working efficiency of the pump and saves energy.
4) Ordinary power frequency control mode (original control mode) can not achieve such a purpose, its start and stop need to be operated by humans, and the valve switch of the water inlet needs to be adjusted to meet the working condition requirements, that is, time-consuming and laborious, and It is prone to operational errors and unnecessary losses. The speed of the motor of the power frequency operation control mode is not adjustable, and the starting current is large. When the water supply pressure exceeds the required pressure value, the size of the inlet valve should be manually adjusted to meet the water supply pressure. At this time, the motor is still running at full load, and the excess power is consumed on the valve, which is a waste of energy.
From the above actual working conditions, the frequency conversion speed regulation method is adopted to meet the production requirements, so that the water injection pump can have both large flow rate and small flow rate, and can operate at both high pressure and low pressure. The pressure or flow rate of the water injection can be controlled by the pressure closed loop or the flow closed loop. When the injection station condition changes, the frequency converter can automatically adjust the water injection pressure or flow rate. At this point, the pump's outlet valve is fully open, reducing the pump's differential pressure to zero. In this way, energy is saved and the maintenance of the valve is reduced. It also improves the automation level of the system, reduces the noise of the system, improves the working environment, and reduces the labor intensity of workers. The frequency conversion speed regulation is used to obtain the actual required water flow, which not only saves the electric energy, but also improves the system automation operation degree; the frequency converter automatically adjusts the rotation speed according to the demand quantity, and is smooth and stable, reducing the labor intensity of the personnel; the operating parameters of the water pump are improved, The system efficiency is greatly improved.
Application of ABB frequency converter in oilfield water injection pump
Oilfield water injection is an important and effective measure to maintain high and stable production in many oil fields in China. The method is to concentrate the oil scattered in the formation to the oil well and extract it. Because Daqing Oilfield belongs to the fault block oilfield, the water injection range of each block is small, and the water injection volume needs to be adjusted frequently with the change of mining conditions. Most of the water injection stations have problems that the rated flow does not match the actual flow. Because of the high pressure and large amount of water in the oilfield, the water injection motor is mostly a high-power motor. The motor is running in a high-energy state for a long time. The variable frequency speed control device is used to adjust the speed of the motor for the oilfield water injection pump to realize the variable water volume control of the water injection pump. A very effective energy saving measure.