Garbage treatment rotary kiln system

Abstract

The invention provides a garbage treatment rotary kiln system which comprises a kiln tail seal chamber, a rotary kiln body, a kiln head seal chamber, a heat exchange device, a mixed gas cooling device and a dehumidifying device. The kiln tail seal chamber is arranged at a feeding end of the rotary kiln body, the kiln head seal chamber is arranged at a slag discharging end of the rotary kiln body, a garbage inlet flat pipe of the kiln tail seal chamber is communicated with the dehumidifying device, the kiln head seal chamber is communicated with the heat exchange device, the heat exchange device is communicated with the dehumidifying device, and a slag discharging device is arranged at the bottom of the kiln head seal chamber. The garbage treatment rotary kiln system is specially used for treating garbage and hazardous substances, garbage pretreatment requirements are low, and operating cost is further reduced.

Description

Technical field [0001] The invention relates to the technical field of garbage treatment, in particular to a garbage treatment rotary kiln system. Background technique [0002] Landfill disposal will cause serious problems such as land occupation and long-term pollution of the surrounding environment, soil and groundwater. At present, it has been recognized that incineration of garbage is the most reasonable. However, the existing incineration technologies all have shortcomings: the airflow of the general incineration rotary kiln is opposite to the direction of the material flow, and the part of the flue gas produced by combustible waste is directly discharged from the lower temperature of the kiln, without passing through the high temperature zone, while the low temperature zone Provides conditions for the generation of various harmful gases. For example, dioxins are most easily formed at 300-400°C, which is very unfavorable for the treatment of harmful substances. Cement co...

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Problems solved by technology

[0002] Landfill disposal will cause serious problems such as land occupation and long-term pollution of the surrounding environment, soil, and groundwater. It has been recognized that incineration of waste is the most reasonable

However, there are deficiencies in several existing incineration technologies: in general, the airflow direction of the incineration rotary kiln is opposite to the direction of the material flow, and the part of the flue gas produced by the combustible garbage is directly discharged from the kiln tail with a lower temperature, without passing through the high temperature zone, while the low temperature zone Provides the conditions for the generation of various harmful gases. For example, dioxin is most likely to form at 300-400 ° C, which is very unfavorable for the treatment of harmful substances; cement enterprises use dry cement production process to dispose of waste is the most recognized solution now. There are mainly two technical routes of waste gasification first and then into the decomposition furnace and waste-derived fuel (RDF) directly into the rotary kiln tail. The gas generated by waste gasification enters directly from the tangential direction or enters from the kiln tail along the axis at a temperature of nearly 1000 ℃ The decomposing furnace, then flows to the preheater with a lower temperature and is finally discharged, without passing through the high temperature zone above 1450 °C that it claims. On the surface, the concentration of dioxin emissions is very low, reaching <0.05ng / Nm3, but it is actually cement The huge flue gas volume in production dilutes the result by about 20 times. For example, the flue gas volume of a 5000t / d rotary kiln is above 280,000 Nm3 / h, while the flue gas volume produced by 300t / d waste incineration can be controlled at 10,000 Nm3 The low emission of dioxins from incineration power generation also benefits from the use of large boilers, increased flue gas volume, and dilution of harmful gas concentrations. The investment in waste incineration power plants is hundreds of millions of yuan, and because the furnace section of the boiler is large, the flue gas The flow control is difficult, resulting in insufficient decomposition of dioxins, and the resynthesis of dioxins cannot be controlled when the flue gas is cooled. Domestic waste entering the boiler also brings a series of problems such as high-temperature chlorine corrosion of boiler tubes.

[0003] The characteristics of garbage disposal are: complex composition, mixed liquid and solid phases, inconvenient pretreatment, moisture content as high as 40%, chlorine and flammable components

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