Regarding multi-nozzle gasifier burners
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What should be done after one pair of burners in a four-nozzle gasification furnace stops operating? The technician told me that if a pair of burners stops working and cannot be put back into use promptly, the other pair of burners can only operate for 8–12 hours. Why is that?
The high-temperature radiation and counterflow convection heat transfer within the gasification furnace heat the burner; when the burner is in operation, the water-coal slurry acts to cool the burner, and if no water-coal slurry flows through it, the temperature of the burner rises.
The gasifier burner is cooled through a burner cooling water system. A pair of burners operating for a short period is mainly due to the flow field distribution in the combustion chamber not matching the design for normal operating conditions, which leads to issues such as uneven combustion.
Can misalignment of a pair of burners have an impact on the furnace’s refractory bricks? What other effects might there be?
After a pair of burners stop working, it is necessary to report this immediately to the dispatch team, as well as the shift leader and the personnel on duty in the workshop. At the same time, the system needs to be stabilized, including those of the other gasifiers. A sudden decrease in the flow rate of syngas will inevitably affect the stability of the entire factory’s operations; therefore, it is essential to report this promptly to the dispatch team. Moreover, a reduced amount of syngas will cause fluctuations in system pressure, which in turn affects the water systems of the other gasifiers. Hence, all staff members must stay vigilant. As for the duration during which a pair of burners can continue to operate, I believe that this depends on both the potential damage to those burners themselves and the damage that could be caused to the furnace bricks in the gasifiers
Under normal conditions, due to the force exerted by the coal slurry and oxygen, the burner is kept at a certain distance from the flame face, which serves to protect that surface. Once this force is no longer present, the burner’s flame face becomes directly exposed to the flames in the furnace, resulting in excessively high temperatures on that surface. Additionally, prolonged operation of a single burner can also lead to changes in its performance