It is difficult to control the deaerator level during the furnace reversal in the Ge process three-stage flash system
Thread Content
What measures do the experts take?
Transferring the feed material for gasification – these are things that should be considered first; for example, at such times one should disregard the temperature of the deaerator and increase the liquid level, with one person on duty to monitor this. That’s it. Done.
For the GE water-coal slurry gasifier shutdown, we carry out three such shutdowns simultaneously. Due to high consumption, the level in the deaerator continues to drop; therefore, we increase the water supply to its maximum level and also enable full reflux of low-pressure ash water. Before carrying out the shutdown, we keep the liquid level above 80%. If the shutdown proceeds smoothly, it is completed when the liquid level drops to around 40%. Once water consumption decreases, the liquid level returns to normal.
We added a low-pressure ash water pump; there’s no need to worry about anything else:lol:lol
High liquid level during furnace dumping should be feasible
Which are the three online furnace transfers you mentioned?
During furnace dumping, a large amount of high-pressure ash water is required. Depending on the pressure of this high-pressure ash water, it may be necessary to reduce the volume of black water used in the operating furnace; at the same time, it is important to control the pressure in the deaerator, otherwise difficulties in adding water will lead to low liquid levels! Personal opinion
Generally speaking, during normal operation, the amount of deoxygenated water used is not very large. During furnace dumping, due to the excessive pressure difference between the outlet of the deaeration water pump and the scrubber tower, it is difficult for the control valve to function properly, making it hard to regulate the amount of deaeration water used. At this time, it is best to use a process manual valve to control the amount of water entering the wash tower during startup. Once the water level is kept at a roughly constant level, try not to make any changes, and regulate the water circulation during operation through other means.
Yes, it is designed with two in use and one as a backup.
The root cause is that the deaerator is too small