Reasons for SHELL ash accumulation
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During operation in SHELL, ash accumulation occurs in the synthesis cooler due to different types of coal, which leads to a high temperature at outlet 18 and severely affects the production capacity. What are the reasons for this ash accumulation? What components of coal are related to it?
It is related to the silicon-aluminum content in the coal ash composition, as well as to the amount of limestone added; a larger amount of limestone leads to the formation of calcium carbonate, which accumulates in the subsequent system
On the one hand, it is related to calcium content, and this aspect is relatively easy to control； Another point is regarding the particle size of the ash as mentioned by SHELL; it should be kept between 10-20 um. Ash particles of this size have self-cleaning properties. However, achieving such a particle size seems to be influenced by many factors, including the type of coal used, the particle size of the coal after grinding, and the control of the oxygen-to-coal ratio, among others.
The particle size of the gray material should be kept between 10-20 um – is that too fine?