A better alternative is de-polymerization, turning the plastic into monomers (or at least oligopolymers). This way, 90% of it can be recycled without degradation.
And the remaining 10% can be burned, of course.
And the remaining 10% can be burned, of course.
I happened to do a project on their fluid dynamics at university :)
They don't have to be this tall, if you need lower throughput or if your products don't have wildly different boiling points.