What does the coking plant in Jingdezhen mainly do? Are doing those things harmful to your health?

Coking generally refers to the process of carbonization and zooming of organic matter. In the dry distillation of coal, it refers to high temperature dry distillation. In petroleum processing, coking is the abbreviation of residue coking, which refers to the process of deep cracking and condensation of heavy oil (such as heavy oil, vacuum residue, cracked residue and even bentonite asphalt) at a high temperature of about 500℃ to produce gas, gasoline, diesel oil, wax oil and petroleum coke. Coking mainly includes delayed coking, kettle coking, open hearth coking, fluid coking coking and flexible coking. Under normal circumstances, all secondary chemical products are directly harmful to human body. But now the production equipment is very advanced, and people don't have to touch those things directly, unless there is an accident, they can be 20 years old. Why not?