Method for controlling discharge of dioxin in incineration process of domestic garbage by sulfur composition in coal

Abstract

The invention relates to a dioxin discharge control technique in processing solid waste materials with an incineration method, aims at providing a method for controlling dioxin discharge in the household garbage incinerating process by utilizing sulfur ingredient in coal and comprises following steps: (1) the coal and the urban household garbage are mixed and poured into a fluidized bed incinerator, and the addition amount of the coal is controlled to be less than 20 percent of the whole mixture weight according to the thermal value of the garbage; (2) smoke gas and carried particles are separated by a high-temperature cyclone separating device; the particles are returned to the incinerator, the smoke gas passes through an afterheat recycling device and then enters a smoke gas purifying device of a semi-drying method; (3) flying ash particles in the smoke gas are removed by a bag-typed dust remover, then the smoke gas is discharged into a chimney through a draught fan. The dioxin discharge control method realizes the low dioxin discharge in the chimney smoke gas and flying ash when processing urban household garbage by the incineration method, has simple technique and system, high thermal efficiency, simple and convenient operation, low equipment investment and running cost, and is particularly applicable to the current processing of urban household garbage with relatively lower thermal value in China and developing countries.

Description

Technical field [0001] The invention relates to a technology for controlling dioxin emission in the process of disposing of solid waste by incineration, in particular to a method for controlling dioxin emission in the process of incineration of domestic garbage by using sulfur components in coal. Background technique [0002] At present, the annual output of urban domestic waste in the country has exceeded 150 million tons, and it is increasing at a rate of 8% to 10% every year. Among more than 660 cities across the country, two-thirds of large and medium-sized cities have been surrounded by garbage, and the urban ecological environment is rapidly deteriorating. [0003] Sanitary landfill, incineration, composting, recycling and comprehensive utilization are currently widely used garbage treatment technologies and methods at home and abroad. Compared with other disposal methods, the incineration method can better achieve the goals of volume reduction, volume reduction and resourc...

AI Technical Summary

Problems solved by technology

At present, the methods used to control the emission of dioxins in the flue gas at the tail of the incinerator mainly include: 1) Adsorb the dioxins in the flue gas by using an activated carbon granular bed, which requires desorption of the granular activated carbon and centralized waste gas treatment. It is complicated and the treatment cost is high; 2) The activated carbon powder sprayed in the flue gas is used to absorb dioxins, combined with bag dust collection, the system is relatively simple, but the bag collected is hazardous waste, which needs further treatment and is expensive; 3) The dioxin in the flue gas is treated by catalytic degradation method, the catalyst is easily poisoned, the treatment cost is high, and the amount of flue gas to be treated is not large; 4) The method of irradiating the flue gas with an electron beam is used to destroy the dioxin in the flue gas, which is used for The voltage to generate the electron beam is very high, the processing capacity is not large, and the energy consumption is large

Generally speaking, the above-mentioned methods for controlling dioxin at the tail of the incinerator all have defects in varying degrees, and the cost of primary treatment is relatively high, and even secondary treatment is required. investment, it also makes the system complex, and there is a problem of reprocessing

[0009] At present, the quality of urban domestic waste in my country is low, and its composition is complex, high in moisture, high in ash, and seasonal fluctuations are large.

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