Vaporizer level control
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In coal water slurry gasification, during normal operation, what level should the liquid level in the gasifier be maintained at, relative to the bottom of the downcomer? What is the typical set value for the low-low level shutdown threshold? (Taking the bottom end of the descent tube as the reference point)
1.8 meters below the lower end of the downcomer; the quench chamber liquid level at the vaporizer trip point is 22.5%
The sizes vary from one manufacturer to another; in normal production, the liquid level in the vaporization furnace is generally kept at around 3500 units above the bottom of the downcomer. The normally set low-low level trip value is around 1500, based on the bottom of the downcomer
Measured from the bottom of the straight section of the quench chamber, it should normally be 3.1 m, and in the case of a vehicle malfunction it should be 2.1 m； Should the liquid level be determined based on the indication of the on-site level gauge or based on the liquid level in the bed inside the quench chamber?
Reply to 3# Comrade Li: Comrade Li would like to ask. On the PID diagram of the Texaco gasifier, I saw that there are interlocks set for the gasifier’s liquid level – an interlock I-1308 is specified for high liquid level, another I-1308 for low liquid level, and I-1301 for extremely low liquid level. What is the function of the interlock I-1308 in handling high and low liquid level conditions? Which devices or instruments are affected when this interlock is activated? Thank you