Drying pretreatment method and device for urban domestic garbage

Abstract

The invention relates to a method and a device for drying pretreatment on municipal domestic refuse by municipal domestic refuse incineration technology. The invention adopts the technical proposal that the method comprises: incinerating the municipal domestic refuse, removing dust of the municipal domestic refuse, taking fume guided out of a fume extractor as a heat source for drying the domestic refuse, and utilizing the fume residual heat to dry the domestic refuse to be treated. The device and the method have the advantages that: 1) high-temperature fume generated from incineration is utilized to dry the domestic refuse, thereby fully recycling the heat energy, and having no influence on the steam generation amount and electricity generation amount synchronously; 2) the high-temperature fume generated from incineration is utilized to dry the domestic refuse, thereby reducing moisture in the refuse, improving 300 to 400 kacal/kg of lower heating value of the refuse, reducing auxiliary fuel addition amount, and reducing operation cost; and 3) after the refuse is dried, because partial moisture in the refuse is discharged, the total amount of the incinerated refuse is reduced, the scale of a incinerator can be reduced, and equipment investment is reduced.

Description

technical field [0001] The invention relates to a treatment technology of urban garbage, in particular to a drying pretreatment method and device for urban household garbage used in the municipal household garbage incineration technology. Background technique [0002] Municipal solid waste disposal is a common issue faced by countries all over the world. The hazards of domestic garbage are mainly manifested as: first, infectious diseases, endangering human health, especially cholera bacteria, tuberculosis bacteria, and roundworm eggs; second, deteriorating the environment and endangering environmental quality; third, destroying resources and endangering ecological balance. Water resources, underground resources, environmental resources and plant growth all have very serious hazards; Fourth, garbage explosion accidents continue to occur. The annual output of domestic waste in my country is as high as 170 million tons, and it is increasing at a rate of about 10% every year; b...

AI Technical Summary

Problems solved by technology

The annual output of domestic waste in my country is as high as 170 million tons, and it is increasing at a rate of about 10% every year; however, the harmless treatment rate of domestic waste in my country is less than 1 / 3, and domestic waste has become a problem that plagues economic development and environmental governance. major issues

First, extend the drying section of the incinerator and increase the drying time. Although the combustion status of the garbage in the combustion section has been improved, a large amount of heat needs to be absorbed in the drying section to dry the garbage. For the heat balance of the entire incinerator, the final combustion temperature No change; and this method is only suitable for grate furnaces, not for fluidized beds; second, part of the hot flue gas after the dust collector is drawn into the drying section of the incinerator, but this method is only for a small part of the waste gas. Recycling, the effect is not obvious, and it is only suitable for grate furnaces, not for fluidized beds; third, use the high-temperature steam of the waste heat boiler to heat the combustion-supporting air to increase the heat and increase the incineration temperature, but the consumption of steam will reduce the power generation for the price

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