Control of the furnace temperature in the gasifier
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For the temperature of the gasification furnace, we usually raise it by increasing the oxygen-to-coal ratio. I’ve heard recently that raising the oxygen concentration at the center of the furnace can also be used to increase its temperature; could someone with expertise please explain this?
As I understand it, the temperature in the gasification furnace is actually the heat generated by the combustion of coal; this heat is produced as a result of the reaction between oxygen and coal. A higher temperature indicates more heat being released, which means that more carbon dioxide is produced. By increasing the temperature, it’s equivalent to increasing the amount of oxygen available, thus raising the oxygen-to-coal ratio. Central oxygen merely alters the flow pattern within the gasification furnace, but increasing the amount of central oxygen also results in a change in the oxygen-to-coal ratio
Personally, I think it’s inappropriate; increasing the amount of coal burned in the reactor raises CO2 levels, so can it still be called a gasification furnace? The gasifier raises the furnace temperature by increasing the oxygen-to-coal ratio, with primary consideration given to incomplete combustion of the coal, resulting in a predominance of CO
It’s better to increase the oxygen concentration for nebulization; this allows the coal to burn more fully, generating more heat and raising the furnace temperature. However, the increase should be slight, and the total amount of oxygen supplied should remain as usual during normal operation.
In the 60 minutes prior to the planned shutdown, the furnace temperature is usually increased to melt the slag; what is the purpose of increasing the central oxygen at this time? Someone told me today that they still haven’t understood it
Central oxygen has an impact on atomization, but as for the extent of this impact, if there is no change after making adjustments, then there is no effect
My understanding is that pre-stopping the furnace and supplying oxygen lengthens the flame to prevent blockage at the furnace outlet