Design of Automation Control System for Oxygen Enriched Spark Ignition Test Device

　　Oxygen rich spark ignition test deviceThe automation control system is the core of achieving precise testing and safe operation, which integrates parameter regulation, process monitoring, and safety interlocking management through multi module collaboration. Its design needs to balance control accuracy and anti-interference ability to meet the complex combustion test requirements in oxygen rich environments.

The sensing layer adopts a multi parameter synchronous acquisition design. The core sensors include: laser oxygen analyzer (accuracy ± 0.1%) for real-time monitoring of mixed gas oxygen concentration; Infrared gas sensors synchronously collect concentrations of fuel components such as methane and propane, with a response time of less than 1 second; High frequency pressure sensor (sampling rate 1kHz) records changes in combustion chamber pressure; Thermocouple array (accuracy ± 0.5 ℃) monitors temperature distribution in different areas. All sensor signals are transmitted to the data acquisition card through shielded wires, and electromagnetic interference is eliminated through photoelectric isolation modules to ensure that data acquisition is not affected at the moment of high-voltage ignition.

The control core adopts PLC+embedded system architecture. The Siemens S7-1200 PLC is responsible for executing logic control, adjusting the opening of the electric control valve through PID algorithm, and controlling the oxygen fuel ratio within a ± 0.5% error range. The embedded system is equipped with an ARM Cortex-A9 processor, which runs custom combustion analysis algorithms and can calculate real-time characteristic parameters such as ignition delay time and combustion rate. The two achieve data exchange through Ethernet communication, with a control cycle of up to 10ms, meeting the requirements of dynamic adjustment. The system is equipped with 100 sets of standard test plans and supports user-defined parameter sequences, such as setting the oxygen concentration from 21% to 90% in a stepwise manner, with each stage lasting for 30 seconds and automatically triggering ignition.

The executing agency focuses on response speed and reliability. Select a direct acting electromagnetic directional valve to control the gas path, with a switching time of less than 50ms; the high-pressure igniter adopts a thyristor triggering method, with continuously adjustable ignition energy (5-30mJ) and synchronous ignition timing error of less than 1ms. To ensure the safety of the oxygen rich environment, the system integrates triple protection: triggering the rupture disk and emergency exhaust valve linkage within 0.1 seconds when overpressure occurs; When the oxygen concentration exceeds the upper limit (95%), the gas source will be automatically cut off and nitrogen purging will be started; When the flame sensor detects accidental combustion, it immediately cuts off all energy inputs.

The human-computer interaction and data management functions are complete. 10.1-inch touch screen displays 16 parameter curves in real-time, supporting local magnification and data annotation; Equipped with emergency stop button and key switch to prevent illegal operation. The data storage adopts a local SD card+cloud backup mode, which automatically records the entire process data of the experiment (including timestamps, parameter values, alarm information), and can be exported as Excel or PDF format reports. The system also supports remote monitoring, pushing critical data to mobile devices through 4G modules to achieve security alerts in an unmanned state.

　　Oxygen rich spark ignition test deviceThe automation control system of has improved the accuracy of test parameter control to ± 1% through hardware redundancy design and software fault-tolerant algorithm, shortened the single test cycle to one-third of traditional manual operation, and compressed the safety accident response time to 0.5 seconds, providing an efficient and reliable test platform for the study of oxygen rich combustion mechanism and fuel explosion characteristics analysis.