Sludge drying and incinerating system on basis of incineration of waste grate furnace and treatment method thereof

Abstract

The invention relates to a sludge drying and incinerating system on the basis of incineration of a waste grate furnace and a treatment method thereof. In the system, after entering a factory, sludge with the moisture content of 80 percent is unloaded into a front material storage bin; the sludge is quantitatively fed into a conditioning tank by a sludge screw conveyer at the bottom of the front material storage bin under a uniform speed; when the sludge enters the conditioning tank, dilution water and the sludge are added into the conditioning tank according to a weight ratio of the dilution water to the sludge of 1:1; when the sludge reaches a high limit liquid level, the sludge is stopped being added; the mixture is stirred uniformly to complete conditioning the sludge; the conditioned sludge with the moisture content of 90 percent is fed into a two-diaphragm vacuum air compressor through a sludge screw pump to be subjected to pressure filtration dehydration and steam heating drying, wherein a dehydrated and dried sludge cake has the moisture content of below 30 percent; after waste heat gas generated in the drying process of the sludge is vacuumized and condensed, wastewater is generated, enters a sewage treatment system to be treated and is discharged after reaching the standard; the waste gas is collected and enters a waste pond of a waste grate furnace incineration system; after the dried sludge is crushed by a crusher, the dried sludge and municipal domestic waste are fed into the grate incineration furnace to be incinerated according to a certain ratio; and the waste gas, fly ash, slags and the like which are generated in the incinerating process can be treated by the existing treatment system of a waste incineration power plant.

Description

Invention field [0001] The present invention relates to a treatment method of sludge from a municipal sewage treatment plant, in particular to a sludge drying and incineration system based on garbage grate furnace incineration and a treatment method thereof. Background technique [0002] In recent years, with the acceleration of urbanization, the population is gradually concentrated in cities and towns, and the amount of urban domestic sewage is increasing. After the domestic sewage is biochemically treated, while the sewage is purified, a large amount of excess sludge will be produced. This sludge has high water content, is perishable, has a strong odor, and contains parasite eggs, pathogenic microorganisms and heavy metals. If it is not properly treated and discharged arbitrarily, it will cause serious secondary pollution. [0003] The higher the moisture content of sludge, the lower its calorific value. The moisture content is a key issue that restricts sludge treatment and reso...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the limitations of the current sludge treatment methods, and provides a sludge drying and incineration system based on garbage grate furnace incineration and its treatment method, so as to achieve "reduction, harmlessness, and resource utilization" of sludge purpose, while reducing the cost of sludge treatment

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