Abnormal components in the gasifier (German-style old model)
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Recently, we’ve had an issue with the furnace here: the CO2 level is too high, staying above 20.5%. We’ve tried to reduce CO2 by lowering the oxygen-to-coal ratio in order to increase the concentration of useful gas components, but the methane level has risen to almost 4000 ppm, and the CO2 level still doesn’t go down. Even by adjusting the central oxygen ratio from 18.3% to 18.7%, there’s no improvement. Could anyone help analyze what might be the cause? (The slag port pressure difference is not high, staying at 40 KPa; it is the Venturi pressure difference that is high, at 400 KPa.)
There are many influencing factors, which can be analyzed by comparing recent coal quality data and the properties of coal water slurry, including slag discharge conditions and the carbon content in the slag.
There are many factors, such as changes in coal quality and burners
Has there been any change in the properties of the raw coal? Some coals have a high methane content from the start. Moreover, the furnace temperature isn’t determined solely by carbon dioxide and methane levels; it’s also important that the furnace temperature matches the ash melting point of the raw coal. What is the form of the slag samples during operation? And what is the operating cycle of your burners? The pressure difference of the burner matters, whether it is high or low