The combustor is also called a burner. According to the fuel, it can be divided into fuel combustor, gas combustor and biomass combustor. According to the use object, it can be divided into kiln combustion machine and boiler combustor, and can be divided into industrial burner, civil burner and special burner according to the application field. The fuel burner is divided into light oil (such as diesel oil) and heavy oil combustor (such as waste oil). Gas combustor can be divided into natural gas combustor, liquefied gas combustor, city gas combustor, biogas combustor and so on. Biomass combustion machine uses biomass particles to burn dust and pollution-free. What we usually refer to as a combustion engine is a boiler burning machine.