1. Introduction to the application of electric actuators in the total pollution source control system
In recent years, after the EIA has analyzed, predicted and assessed the possible environmental impacts after the implementation of planning and construction projects, the environmental protection department has introduced a management system for total pollution source control and strictly controlled pollution source emissions from the source. Once it is confirmed that the phenomenon of exceeding the total amount has occurred, law enforcement officers immediately shut the valve through the remote end of the pollution source total control system to prevent the pollution source from spreading further. This method provides an automated solution for environmental law enforcement.
Second, the working principle of electric actuators
Electric actuator is a combination of actuator and control valve in automatic control system. Its function in the automatic control system is to receive the signal from the regulator, and adjust the flow of the process medium with its position and characteristics in the process pipeline, so as to control it within the range required by the production process.
Third, the structure of the electric actuator
The electric actuator consists of two major mechanisms: execution and adjustment. The controller sends a current signal to the electronic control device. The electronic control device controls the rotation and displacement of the actuator (usually a motor). When the actuator turns the valve opening to a certain position, the resistance value of the sliding rheostat is driven by a simple gear unit The resistance value of the sliding rheostat in the corresponding position is converted into a current or voltage signal by the detection unit, and the control signal is compared after feedback, until it stops rotating when it matches the current sent by the controller. This series is called Adjustment unit.
Fourth, the field installation method of electric actuator
In the total volume control system, the actuator is generally installed in the direction of the flow of the medium, usually on the same section of the pipeline as the pipeline flowmeter, and needs to be installed at the back end of the flowmeter. The reason is that the vortex phenomenon occurs when the actuator is opened and closed. It is easy to produce a certain amount of air bubbles in the pipeline. In practical installation, it is generally installed at a pipe diameter 3 times the same pipe section as the flowmeter (experience value, for reference).
Five, the proofreading method of electric actuator
In the total pollution source control system, the actuator often exhibits angular drift during execution, which causes the environmental law enforcement personnel to be unable to correctly open and close the electric actuator. To adjust the actuator opening, only two points of correction are required, the same as the PH meter The principle is to correct at the position of the closed position and the open position.
