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Low down things are good!
The conversion for use of Vegetable Oil would likely be quite easy for modern internal combustion ships.
I am not sure that wood qualifies as a "clean" fuel, since it produces a lot of ash. This could violate pollution regulations while the ship is in harbour.... or you could use electrostatic scrubbers to collect it - and then you have an ash disposal problem when you reach harbour.
PS: Does nuclear power count as "solid fuel"?
If you could make woodgas, or something similar, then the existing engines could probably be converted to use it. However, it would only be good if it could compete with the efficiency of a direct steam engine.
As for slurry fuel... not a practical thing to do in the slightest.