designs and drawing of a reactor,condensor(heat exhanger with a shell and tube) and a distillation column for a pyrolysis plant.

reactors - https://grabcad.com/library?page=1&time=all_time&sort=recent&query=reactor
condensers - https://grabcad.com/library?page=1&time=all_time&sort=recent&query=shell%20and%20tube
distillation - https://grabcad.com/library?page=1&time=all_time&sort=recent&query=distillation
pyrolysis - https://grabcad.com/library?page=1&time=all_time&sort=recent&query=pyrolysis

No details regarding what type of help is needed on the components, so hopefully the above links will be a good starting point.

A pyrolysis plant to convert plastic to fuel, seems to be a great idea. The amount of plastic waste to dispose of is becoming a big problem world wide. The first step in coming up with a design to suit your requirements depends on the amount of waste, available budget along with engineering resources available to you. A quick youtube search will turn up a range of options from backyard D.I.Y
https://www.youtube.com/watch?v=f3ESuY0pekU
https://www.youtube.com/watch?v=8f81yn7yKLc

More sophisticated small plant
https://www.youtube.com/watch?v=lyF1j3IoGho
https://www.youtube.com/watch?v=SzdccTkxT2A
https://www.youtube.com/watch?v=Skt_iAexEBk

To commercial scale plant
https://www.youtube.com/watch?v=2uWaXkNayOM
https://www.youtube.com/watch?v=iqbTz2lb4Oc
https://www.youtube.com/watch?v=fIDETXbTFWo
https://www.youtube.com/watch?v=EthyDDYNH5Q
https://www.youtube.com/watch?v=LE4zkdmTs4M

So the first step is to make sure you understand the basic process then come up with a basic specification as regards to level of sophistication processing rate then the designs of the component parts can be worked on

the most biggest problems in plastics is additives. For that reason you have most problems to solve a quality of prylisis. That probleems must solve a chemical engineers, but what to do with a waste from this process?