Direct combustion incinerators process VOCs through the principle of high-temperature oxidation. The internal structure of conventional furnaces is a cavity structure, and various heat recovery devices such as heat exchangers and boilers can be installed outside the furnace according to customer needs. Direct combustion incinerators can be widely used for complex waste gases with high concentrations and particulate matter, and effectively recover the heat energy released during the oxidation process. Direct combustion incinerators have diverse shapes and can be designed according to the characteristics of the site space, such as square and cylindrical chambers. They can also be made into vertical furnaces, horizontal furnaces, L-shaped furnaces, etc.