How to determine whether the fire has been extinguished due to coking in the furnace or due to ash accumulation at the flame deflection angle?

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What is the difference between extinguishing a fire caused by coke falling into the furnace chamber and extinguishing a fire caused by ash accumulation at the flame deflection angle? How can one determine whether it is a fire caused by coke falling into the furnace chamber or by ash accumulation at the flame deflection angle? u- O4 l1 e, h+ The time it takes for the boiler to stop functioning is very short, only a few seconds, due to coke falling into the furnace and ash collapsing as a result of the altered flame angle. |6 D5 In these two situations, it is difficult to make a judgment based on visual observations; only by checking the historical data curves can such judgments be made. In my opinion, the main difference lies in the following: when coking occurs in the furnace and leads to its shutdown, a high positive pressure is generated in the furnace. The primary reason for this is that the coking residue falls into the cold ash hopper, causing the seal in that hopper as well as the cooling water to vaporize ； ( T( H; w3 h4 v) L+ z) {" r1 E+ _# ? When flame deflection and ash collapse cause the boiler to shut down, no large positive pressure is generated in the furnace; instead, negative pressure in the furnace increases. The main reason for this is that the ash collapse leads to the extinguishment of the flames in some burners. I’m not sure if this analysis is correct; please share your insights!