Instrument self-protection interlock
Thread Content
The newly installed unit has many safety interlocks, including automatic ignition and automatic purging, automatic shutdown of the supply fans, interlocks in case of high acidic gas pressure, and flame detectors. I’m not very clear about the above chain; please advise. Additionally: Have all your self-protection measures been put into use? Thanks!
Interlock is a safety measure in case of abnormal operation, so facilities in typical petrochemical companies are equipped with interlocks. However, interlocks must be regularly tested, and employees must receive thorough training to prevent errors and improper operations. The interlocks you mentioned are necessary; in addition, a low level interlock for the waste boiler fluid and a high temperature interlock for the furnace chamber should also be added. Additionally, the setup of interlocks is mainly modeled after foreign practices; it has only become popular in China in recent years. Our sulfur recovery unit was introduced from abroad in 1992, with initially over 50 links; later, based on our usage experience and actual conditions, the number of links was reduced to around 10.
Whether having many interlocks is good or not depends on whether the instrumentation is reliable; if the instrumentation is unreliable, having many interlocks only creates more problems. Reliable instrument interlocks are certainly a good thing; what’s most important is to be willing to invest in high-quality instruments, and proper maintenance of those instruments once they arrive at the site is also essential.
Self-protection interlock is an important measure used for automatic monitoring and control. When certain process parameters in equipment or pipelines exceed their limits or when abnormal operating conditions occur, the self-protection interlock ensures that the production process remains in a safe state. “Automatic ignition and automatic purging, automatic shutdown of the supply fan, shutdown in case of high acidic gas pressure, and interlock based on flame detection – these are relatively simple mechanisms; they represent the common safety interlocks used in combustion furnaces. Their logical control is intended solely to ensure the safe and reliable operation of the furnace. Its self-protection mechanisms against over-temperature and over-pressure rely primarily on solenoid valves on site, with the accompanying interlock solutions generally being provided by the supplier of the automatic flame detector.