As a clean energy, natural gas is more and more popular. In the entire gathering and transportation system, the natural gas distribution station accounts for a large proportion of the entire gas transmission process and is a very important link. Its reliability determines to a large extent the safety of the entire pipeline transmission system, and the pressure regulating system It plays a pivotal role in the natural gas distribution station. It is not difficult to ensure safe and stable pressure and air supply for stations, but it is more difficult for users who are closer, have less pipe storage, and have large changes in air consumption to use commonly used pressure and flow adjustments. For this reason, we have added Set up a kind of pressure regulation method-electric control valve adaptive control.
Technical Principle
The adaptive control system is combined with the original station control system to form the overall adaptive control system for natural gas pipeline distribution. The original station control system includes PLC, RCI, station controller, field instruments, third-party intelligent equipment, etc., while the adaptive control system is a workstation.
In the entire distribution station control system, the PLC collects various process parameters on site, among which the pressure, temperature, valve position and other signals are directly collected by the PLC data acquisition module, and the flow signal is collected by the RCI and the flow computer and then written into the PLC register. , All PLC information is displayed through HMI, and operators can set various control parameters in HMI. The adaptive control system reads the required standard flow rate, pressure regulator inlet and outlet pressure, electric control valve position feedback, pressure setting value, flow setting value and other data from the PLC, according to the selected adaptive control strategy Calculate the valve position control amount, and write the control amount to the PLC, and then output it to the on-site electric control valve actuator after digital-to-analog conversion by the PLC to realize the final control function
