Combustor is also called burner. According to fuel, it can be divided into fuel burning machine, gas burning machine and biomass burning machine. According to the object of application, it can be divided into kiln combustion machine and boiler burning machine. According to application field, it can be divided into industrial burner, civil burner and special burner. The fuel burner is divided into light oil (diesel) and heavy oil combustion machine (such as waste oil), gas burning machine is divided into natural gas combustion, liquefied gas burning machine, city gas burning machine, biogas combustion machine, biomass combustion machine is the use of clean pollution-free biomass combustion. What we normally mean by a combustor is a boiler combustor.