Problems associated with using Shell powder gasification for coal types with low ash melting point, low ash content, high volatility, and high carbon content
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Dear marine industry professionals and experts in Shell’s gasification technology, when using this technology to gasify coal types with low ash melting points, low ash content, high volatility, and high carbon content, what issues need to be taken into consideration? What measures can be taken to ensure a relatively high carbon conversion rate and cold gas efficiency? How can we ensure proper slag formation on the membrane water-cooling wall of the gasifier, thereby realizing the slag-resistant mechanism in Shell powder coal gasification?
Increasing the oxygen consumption can raise the carbon conversion rate, which is beneficial for coal gasification; this in turn increases the ash content, allowing for proper slag formation. The slag can then be used to counteract other slags, while low-quality coal can be utilized more effectively.
For coal types with low ash melting point, low ash content, high volatility, and high carbon content, the oxygen consumption during gasification is relatively low. For the same amount of coal, those with a higher fixed carbon content produce less gas; it is necessary to analyze this in terms of production levels
Coal types with low ash melting point, low ash content, high volatile matter, and high carbon content are, literally speaking, good coal. It is very suitable for the Shell process. Generally speaking, a medium to low ash fusion point is beneficial for Shell gasifiers. How is the moisture level? What exactly is the ash fusion point? Is high volatilicity indicative of lignite? It would be best if the original poster could post the coal quality analysis data, so that a detailed analysis can be conducted.
Cold gas has high efficiency; one can only turn to Lurgi. Shell’s CH4 content is very low, not very high at all.
Your material has a high volatile content, which gives it good gasification activity; its ash melting point is low, allowing for lower gasification temperatures to be used. However, the low ash content results in poor slag formation. It would be best to incorporate the filter cake into the raw coal according to the SHELL design, thereby increasing the ash content and improving slag formation. This can also enhance the utilization rate of residual carbon and increase the carbon conversion rate.