Rotary kiln garbage incinerator
The rotary kiln incinerator is a rotary kiln. It is constructed by laying refractory bricks in a cylindrical metal shell that is slightly tilted horizontally. , The process of ignition and burning. After the rotary kiln is equipped with a secondary combustion chamber, the combustible gas generated by the decomposition and gasification of garbage in the rotary kiln reaches complete combustion in the secondary combustion chamber. The complete rotary kiln combustion system consists of rotary kiln, secondary combustion chamber and auxiliary equipment.
The temperature in the rotary kiln system is controlled at 850 ~ 950 ℃, and the residence time of the waste in the rotary kiln is about 1h. The temperature of the secondary combustion chamber is controlled at 1100 ℃, the residence time of the flue gas in the secondary combustion chamber is greater than 2s, to ensure that the garbage waste entering the incineration system can be fully burned, and the volatile and harmful substances in the flue gas, especially the dioxins with strong carcinogenicity The British are fully burned to achieve harmless purposes.
Refractories for rotary kiln waste incinerator
Rotary kiln working condition
Although the rotary kiln waste incinerator uses rotary kiln equipment, the working conditions are completely different from the cement rotary kiln with a stable composition of the materials entering the kiln and a mature and stable thermal engineering system.
The temperature in the waste incinerator of the rotary kiln is not lower than 800 ° C. The waste garbage is fully burned and decomposed during the continuous movement, and the kiln lining is ground and washed with the dust in the flue gas; the alkali (potassium, sodium) generated by the waste garbage decomposition, Halogen (chlorine, fluorine) and sulfur compounds form strong chemical erosion on the kiln lining material; in the case of unstable shutdown, start-up and rotating operation, the kiln lining material is prone to frequent changes in temperature and the chemistry of the atmosphere in the kiln Cracking and flaking occurs under the combined action of erosion.
Therefore, refractories for rotary kilns must have the following characteristics:
(1) High temperature resistance, it can run stably in a temperature environment above 800 ℃ for a long time.
(2) High strength and good abrasion resistance, resistant to rubbing and rubbing of garbage waste and smoke dust.
(3) Low porosity and good chemical stability, resist the penetration of chemical substances in the flue gas in the kiln.
(4) Good thermal shock stability, withstand the alternating thermal stress under burning conditions.
(5) The high-temperature volume stability is good, to avoid damage due to the mechanical stress of the kiln body.
Refractories for rotary kiln
Comprehensive kiln working condition environment and performance requirements for refractory materials, refractory materials for kiln lining mainly include high-alumina bricks, mullite bricks, silicon carbide bricks, silicon-molybdenum bricks, chrome corundum bricks and chromium corundum castables (plastics) Etc., mullite castables can be used in the kiln and other parts
Secondary combustion chamber
The secondary combustion chamber is located behind the rotary kiln, and is mainly responsible for the reburning of the combustion residue of the rotary kiln and the high-temperature treatment of the combustion flue gas. The indoor temperature is above 1100 ℃, and the chemical composition of the internal flue gas is slightly acidic. It has high soft temperature, good resistance to chemical attack and has certain thermal shock stability.
Refractories for secondary combustion chamber
High-alumina bricks or zirconium-containing anti-stripping high-alumina bricks are generally used for the refractory materials in the second combustion chamber, and high-aluminum high-strength castables or mullite castables are used for the connection parts and special complex parts with the rotary kiln. In order to reduce the heat loss, there is a heat insulation layer behind the working layer, and the refractory materials are light-weight insulation brick and ceramic fiber board.
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