Domestic waste incineration technology has three major categories: stratified combustion , fluidized bed combustion 
technology and rotary combustion technology ( also known as rotary kiln type ) . A layered stratified combustion technology 
development of combustion technology is more mature , some countries are using this combustion technology . To make 
junk stable combustion process , the key is stratified combustion grate . Garbage on the grate through three zones : Preheat 
a dry area, the main combustion zone and burnout zone . Garbage on the grate fire , not only from the heat radiation and 
convection at the top of the flue gas , but also from inside the garbage layer . Has been on fire in the grate of the garbage 
in the special role of the grate , so that the garbage layer strongly flip and stir constantly pushing whereabouts , causing the 
bottom of the garbage began to fire, flip and stir continuously , so that the garbage layer loose, breathable strengthening 
helps the ignition and combustion of garbage . Furnace arch shape design should consider the flue gas flow field in favor of 
the new hot flue gas heat radiation into the garbage drying and preheating zone garbage burning embers burning embers . 
Designed to ensure that the air with the wind on the grate rubbish layer optimal distribution and rational use of primary and 
secondary air . Second, the fluidized bed combustion technology fluidized bed combustion technology has been developed, 
because of its high thermal strength , more suitable for burning low calorific value , high moisture content of the fuel . Also, 
because of its large heat storage furnace , the combustion of refuse in a substantially can not support combustion. In order 
to ensure adequate flow into the furnace of garbage on garbage into the furnace size requirements are more stringent , 
requiring a series of screening and crushing trash and other treatment to the size , condition homogenization . Generally 
broken into "15cm, and then fed into the fluidized bed combustion, bed material is quartz sand , air distribution plate is 
usually designed into an inverted pyramid structure of L -type hood . Controlling the combustion temperature in the bed at 
800-900 ℃, the flow rate of the cold air flow section 2m / s, the thermal state of 3 ~ 4m / s. Primary air into the fluidized bed 
through the air distribution plate through the hood, the secondary air stream into the upper layer . Preheat the use of fuel 
material layer , put garbage incineration material layer when the temperature reaches about 600 ℃. The furnace starts, 
ordinary fluidized bed combustion boiler with similar characteristics . Third, the rotation of the rotating combustion device 
main combustion incinerator is a slowly rotating kiln, the inner wall can be brick masonry , waterwall tube may also be used 
to protect the cylinder , the diameter of the rotary kiln 4-6m, the length 10-20m, according to the determination of the 
amount of waste incineration , tilted . Each waste volume is currently up to 300t / d ( diameter 4m, length 14m). Kiln past, 
mainly for handling of hazardous hospital waste and chemical waste. It is a slowly rotating drum through the furnace body , 
the inner wall temperature copy board trash barrel from the lower to the upper part of the barrel when the barrel roll, and 
then rely on garbage weight down. Since the garbage in the barrel Rotary Dryer , you can get full contact with the air , for a more 
complete combustion . Waste is fed into one end of the drum , the hot flue gas be dried , after reaching the ignition 
temperature of combustion , with the barrel rolling , tumbling and falling garbage get until the outlet tube ash . When 
excessive moisture garbage can increase the level of the grate in the rear cylinder , used to meet the burning ember , drum 
exhaust fumes , burning embers through a vertical chamber ( secondary combustion chamber ) . Indoor burning embers 
into the secondary air , flue gas combustible components in this fully burned. Universal secondary combustion chamber 
temperature is 1000-1200 ℃. Garbage burning kiln means low-cost, power consumption compared to other vendors 
combustion and less , but the calorific value of less than 5000kJ/kg waste water containing high combustion with some 
difficulty .