Stirrer
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If the mixer in the operating slurry tank stops working, what impact does that have on the furnace? And how can one tell if the mixer has been stopped for too long, with slurry continuing to be poured into the tank? The mixer must not stop for too long.
In production, it must run without interruption at all costs. How can one tell that the stop time is too long? How should this be understood? The stirrer in the slurry tank is shut down, resulting in unstable parameters of the slurry in the tank such as temperature, viscosity, and concentration. The impact of unstable slurry quality on the vaporizer – there’s no need to go into too much detail on this! As you know, it is therefore necessary to strengthen the maintenance of the coal slurry tank agitators, conduct thorough inspections, and address any abnormalities promptly.
The coal slurry tank mentioned by the poster should refer to the large coal slurry tank. It is best for the mixer in this large tank not to stop operating. If this mixer stops working, there may not be any significant issues in the short term (a few hours), but the longer it remains stopped, the greater the risk of the system shutting down. This is because if the coal slurry in the tank is not stirred, it tends to settle and form clumps, especially when the level of slurry in the tank is high and under the pressure exerted by its own weight. If lumps form at the bottom of the slurry tank, it will result in blockage of the inlet to the slurry pump or of the pump’s cushioning elements, and the consequences of that are obvious. When the mixer is in operation, the difference between the temperatures of the two thermometers located at the top and bottom of the large coal slurry tank should be around 1–2°C. If the mixer stops working, this temperature difference increases significantly; the longer it stays stopped, the greater the difference becomes. This method can be used to determine whether the mixer has stopped operating. Of course, this method is somewhat slow; it takes time for the mixer to stop operating before a reaction occurs due to the temperature difference. Careful and thorough work is still required both in the control room and during on-site inspections.
Thank you to the moderator for the helpful answer. I have another question: how can I determine if there is a problem with the blades of the coal slurry mixer?
It’s really hard to tell if there’s a problem with the leaf; you can’t see it or touch it. If the blades fall off, it’s equivalent to the mixer stopping operation; this is somewhat easier to determine, as one can check the current drawn by the mixer motor – the current will decrease significantly when the blades fall off