I don't know if it is intended or not, but when I put charcoal in the machine I get 20 Carbon and when I put coal I get 10,

Yes, it's intended as charcoal is a more pure form of carbon than coal. But I suggest you run your (char)coal through the enrichment chamber before using it in the infuser - you get compressed carbon from the enrichment chamber which counts as 100 units of carbon in the infuser. :)

Thanks for the info I have just got started in mekanism, anyways thanks for the support