Q.Can the tail gas that generate in  the pyrolysis process be used to be burnt off for the fuel of the reactor, 
and as such saving energy for the machine? 

Tail gas in the pyrolysis process can be reused.

A.Yes, the waste gas could be recycled as the fuel of pyrolysis plant. There exists a tube, we called
tail gas pipeline that joint the pyrolysis plant and 
by the tail gas pipeline, the gas can be delivered into the reator, which can be burned as the fuel. This
kind of design not only save the fuel but also avoid
polluting the environment.