Texaco gasification water vapor ratio
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This post was last edited by lflsedin on 2016-11-21 at 21:15. Why does high ash content in Texaco gasifiers lead to an increased heat load and a higher water vapor ratio? What is the relationship between these two factors?
A high ash content means that the raw coal has a high ash content; when using coal with such a high ash content, an operation with a higher oxygen-to-coal ratio is adopted to prevent blockages at the slag outlet caused by excessive ash. Therefore, the operation with high-oxygen coal leads to an increase in the heat load, and an increased heat load naturally results in an increased water vapor ratio. There is no direct connection between the two, but it is the operational requirements imposed by the system that create such a link between them
Some literature states that a high ash content requires more heat to melt the ash residues. However, when the load remains constant, a high ash content leads to a relative decrease in fixed carbon, as well as a reduction in the endothermic gasification reactions, which results in heat release. Under the same oxygen-to-coal ratio conditions, it is sometimes observed that the furnace temperature does not drop but instead rises due to the high ash content; in such cases, it is necessary to reduce the oxygen-to-coal ratio
Precisely because coal-water slurry uses the coal feed rate as a parameter for determining the load, when coal with a high ash content is fed into the furnace during normal operation, the actual oxygen-to-coal ratio increases. As a result, the temperature of the gasification furnace rises, which leads to the increase in thermal load mentioned by the original poster. It is necessary to increase the water vapor ratio or reduce the oxygen-coal ratio to adjust the furnace temperature.
I don’t quite understand; I’m just here to learn from everyone’s answers!
Some say to increase the oxygen-coal ratio in the operation; I’m not quite sure about that
With the water circulation volume for vaporization remaining unchanged and the heat load increasing, the water-to-vapor ratio will naturally rise