Wet sludge drying and incinerating treatment method employing circulating fluidized bed with particle dryer

Abstract

The invention relates to a method for burning wet sludge with cycle fluid bed with grain drier, wherein in the cycle fluid bed burning furnace or the cycle fluid bed burning furnace burns the wet sludge whose water content is 60-90%; the drying and burning are integrated in one device; the wet sludge being dried in the grain drier is feedback to the hearth with cycle ash to be burnt, to avoid the water content of wet sludge into the tail smoke channel with the high temperature smoke of hearth, but be leaded out with the fluid airflow of grain drier, to reduce the heat loose; and the discharge gas of grain drier, via dust cleaning and wet removing, is used or fed into hearth to be burnt, without smelly gas in the process.

Description

technical field [0001] The invention relates to a treatment method of waste (wet sludge), in particular to a treatment method of wet sludge combining drying and incineration with particle drier. technical background [0002] Sludge is the solid residue after sewage treatment, and the amount of sludge accounts for about 3‰ to 5‰ of the sewage treatment volume (calculated with a water content of 97%). The amount of industrial and domestic sewage treatment in our country is increasing rapidly. With the continuous construction of sewage treatment plants, more sludge will be produced. The composition of sludge is very complex. In addition to a large amount of water, it also contains a large amount of organic matter, refractory organic matter, various trace elements, pathogenic microorganisms, parasite eggs, and heavy metals. [0003] The sludge treatment method centered on incineration can achieve the goals of reduction, stabilization and harmlessness. However, most of the exis...

AI Technical Summary

Problems solved by technology

However, most of the existing sludge incineration methods require the use of special equipment to dry the sludge before incineration. The drying and incineration are completed in two sets of equipment, and the system is complicated; the drying equipment consumes a lot of energy , high operating costs and high safety requirements; and incineration of dry sludge will produce a large amount of NOx, and a denitrification device needs to be installed after the incinerator; at the same time, because the sludge contains sulfur, a desulfurization device needs to be equipped after the incinerator

This makes the sludge incineration system complicated and the cost of harmless treatment high

[0004] Directly add undried wet sludge to the incinerator for incineration, and unit processes such as sludge drying, incineration, and even flue gas harmless treatment can be concentrated in a single device at the same time, simplifying the sludge incineration treatment process , to reduce the cost of treatment; but the moisture contained in the wet sludge will be discharged out of the furnace together with the flue gas produced by incineration, taking away a lot of heat and increasing the consumption of auxiliary fuel

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