Urban refuse thermal decomposition processing method

Abstract

The invention discloses a municipal refuse pyrolysis processing method, which puts the combustible gas into the air inlet of the container of the municipal refuse; the high temperature combustible gas dries and pyrolyzes the municipal refuse; the air in the container filled with the municipal refuse is discharged from the air outlet of the container; the fuel gas discharged from the air outlet of the container is burnt completely in the gas burner. The invention uses the biomass high temperature combustible gas generated by the forestry and agricultural residues to re-pyrolyzes the municipal refuse, opens up the novel usage of the biomass energy high efficiency use, to make the biomass energy utilization, the environmental protection, the refuse innocuity, the refuse resource integrated.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of urban garbage, in particular to a method for pyrolysis treatment of urban garbage. Background technique [0002] Dioxins are tricyclic aromatic organic compounds composed of two or one oxygen atoms linked by two chlorine-substituted benzene rings, including polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), with a total of 210 Congeners are collectively referred to as dioxins. Studies have shown that the concentration of precursors, the concentration of chlorine in flue gas, the temperature of flue gas, the catalyst, the oxygen content of flue gas, and the S content of fuel have important effects on the emission of dioxins during waste incineration. The main precursors of dioxins are chlorophenols, chlorobenzenes and PCBs. Chlorophenol, chlorobenzene, polyvinyl chloride PVC, polyvinyl chloride PVDC mainly produce PCDDs; polychlorinated biphenyls and p...

AI Technical Summary

Problems solved by technology

The garbage is directly burned in the furnace, and the flue gas produced by the chemical reaction has many harmful components, which inevitably leads to the oxidation of copper and the production of HCL. Due to the lack of the grate itself, sometimes the garbage tumbling may not be sufficient, resulting in unsafe combustion. Unburned embers v. carbon remaining in fly ash, the presence of these substances allows the resynthesis of decomposed dioxins in boilers and electrostatic precipitators

In addition, because the furnace temperature of the grate furnace fluctuates due to the change of the calorific value of the waste, it is difficult to guarantee the complete decomposition of the dioxins produced during the waste incineration process, resulting in an increase in the emission of dioxins

To eliminate dioxins, it is necessary to invest in expensive tail gas treatment equipment and activated carbon adsorption. This obviously costs too much, which makes the original high investment, huge flue gas purification system, and high operating costs more prominent.

Moreover, the activated carbon after use cannot be regenerated and becomes a new source of poison, which must be handled with care