Catalytic cracking turbine
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What is the lowest possible inlet temperature for a steam turbine?
The normal range is generally 435 ± 10; values below 400 are considered dangerous, and it is necessary to enhance condensation to prevent surging caused by steam carrying water.
Half of it is between 380 and 420; it’s best not to let the value drop below 350 for long periods. Steam containing water can be very dangerous. Once, water was present in the raw material, which caused overpressure in the settler and overheating in the regenerator (in a coaxial configuration). The external heat extraction system was overloaded, and large amounts of unsaturated steam entered the waste heat boiler, exceeding its capacity for superheating. This steam then reached the turbine, destroying both the steam seal and the oil seal. It took a whole day of emergency repairs to fix the problem. Fortunately, the impeller wasn’t damaged.
Above 350°C； It mainly depends on the pressure conditions; superheated steam will do.