Three-channel burner: interruption of central oxygen for a period of time has an impact on the gasification furnace
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For a three-channel burner, what is the impact on the gasification furnace if the oxygen supply at the center is interrupted for a period of time? What is the impact of the burner? ?
Central oxygen is the most important; the furnace should be shut down via interlock
It can’t be that serious; if it only stops for a few minutes, there’s no need to stop at all. There is flexibility in any operations, so this shouldn’t cause an interlock
I can’t stop this gasification furnace. . 、。
The central oxygen has the effects of atomizing the coal slurry and creating a stretched flame; so what impacts would occur if this is interrupted? Poor atomization, poor reaction, increased oxygen and coal consumption, slag accumulation in the gasifier furnace or at the slag outlet, and excessively high local wall temperatures in the gasifier.
I think stopping the central oxygen supply not only affects the nebulization effect; of course, it also has an adverse impact on the burners and furnace bricks； More importantly, how can you get the central oxygen back in? Let’s take a look at the process: during normal operation, the central oxygen valve is closed – slurry, and even syngas, enter the central chamber – then the central oxygen is turned back on. . . . . . It’s not an exaggeration; one facility I’m aware of had its burner explode after restarting the central oxygen supply
The explosion of the burner mentioned above, caused by the injection center, was it due to coal slurry entering the central oxygen pipeline and resulting in an excess of oxygen? The closure of the central oxygen valve would only occur if there was a malfunction with the solenoid valve or some other component. Once normal operations are resumed, burning in small amounts multiple times under low load conditions while paying attention to the oxygen-coal ratio should allow such situations as burner explosion to be avoided. However, these are just guesses; no one would dare to try this during normal production.
Since it is pure oxygen, any contact with flammable materials will cause combustion at a temperature far lower than that required for ignition in air, leading to a violent reaction and thus an explosion. If a nitrogen blower is installed separately in the central chamber, and the central oxygen valve is closed, manually opening this blower for a while before slowly opening the central oxygen valve should help prevent accidents
Well, this principle is somewhat similar to the high-pressure nitrogen purge used in the nozzles of spacecraft furnace processes; once the gasification furnace is ignited and its temperature rises, the valves in the gas pipeline are closed, and high-pressure nitrogen is used for purge protection.
Some time ago, due to a fault in the check valve, the central oxygen could not be supplied to our plant; the flow rate was practically zero. After shutting down the furnace and checking the central oxygen pipeline, it was found that coal slurry had entered the pipeline – what a scare! ! !
I tried it once; after feeding the material, I wasn’t sure whether it was due to an operator’s mistake or something else, but I found that the central oxygen valve was closed. So I asked him to gradually open it fully and adjust the flow rate accordingly. No issues were found during operation at that time