Waste Incineration Rotary Kiln

The length to diameter ratio (L/D) ratio in the design of rotary kiln should be appropriate, which can extend the stop time of waste in the rotary kiln, and ensure that all the drying and decomposition of hazardous waste in the rotary kiln and the incineration of solid substances and the burning of slag. At the same time, it adopts the form of flue gas flow to make part of the unburned refuse in the rotary kiln continue to burn at the bottom of the slag chamber until it burns. The rotary kiln is equipped with a pushing mechanism at the feed port to ensure continuous feed. The outlet temperature of the rotary kiln is 800 ~ 850℃, and after the flue gas enters the secondary combustion chamber, secondary air is tangentially injected around the secondary combustion chamber, so that a strong vortex field is formed in the secondary combustion chamber, and the combustible components in the flue gas can be fully burned. At the same time, the secondary combustion chamber adopts the unique structural design to make the secondary combustion chamber have the function of swirling wind dust removal. The outlet smoke temperature of the secondary combustion chamber is greater than 1100 ° C, and the residence time of the smoke in the high temperature zone is more than 2 seconds, which ensures the thorough decomposition of the harmful components including dioxins in the smoke, and meets the requirements for the incineration of hazardous waste. The incinerator is equipped with an auxiliary combustion system. When the heat value of the waste is low and the temperature required by the process cannot be guaranteed, the auxiliary combustion system automatically opens to ensure the temperature and incineration effect required by the incineration.

Solid (hazardous) waste is sent into the rotary kiln through the feeding mechanism for high temperature incination. After about 60min (45-70) of high temperature incination, the material is completely incinerated into high temperature flue gas and ash slag. The rotating speed of the rotary kiln can be adjusted, and the stable slag layer of about 50mm thick can play the role of protecting the refractory layer. Its operating temperature should be controlled at about 850℃, high temperature flue gas and ash from the kiln tail into the secondary combustion chamber, incineration ash from the kiln tail into the slag machine, and regularly sent to the stabilization/solidification workshop for treatment.