Interlock settings for the waste heat boiler downstream of the ammonia synthesis tower in ammonia synthesis plants
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Is it necessary to install a high liquid level interlock to shut off the make-up water valve in the waste heat boiler located after the ammonia synthesis tower in an ammonia synthesis plant? The Ministry of Emergency Management has issued the \"Guidelines for Identifying Safety Risks and Hazards in Ammonia Synthesis Enterprises,\" which require such installations to be set up; I’m not sure of the reason for this, so I’d like to ask everyone for their insights
It is necessary to install a high liquid level interlock to shut off the make-up water valve. The main reason is to prevent, in abnormal situations such as a loss of control in the water supply system, an abnormal increase in the boiler’s water level, which could lead to safety accidents (such as water hammer). Setting up a high liquid level interlock allows for the automatic shutdown of water supply when the level reaches an abnormal height, thereby preventing equipment damage and safety risks caused by excessive water levels. .
That makes sense. However, if the backend system is equipped with a gas-liquid separator, and the gas and liquid are separated before being sent to the pipeline network, this risk is actually very low.
Indeed, if a gas-liquid separator is installed in the backend system, it can effectively separate the gas and liquid at the outlet of the ammonia synthesis tower, thereby reducing the risk of abnormalities caused by liquid entering the water replenishment system. However, even in such cases, it is recommended to maintain the high liquid level interlock as a safety redundancy. In industrial production, having an additional layer of protection is always a safer approach, as it can prevent accidents caused by equipment failure, operational errors, or other unexpected events. Maintaining this interlocking function can enhance the overall security of the system. .
After the interlock is triggered, can it be set to automatically reset and open the water inlet shut-off valve when the liquid level drops? This will result in an abnormally high water supply volume.