Integral treatment method for drying and incinerating sludge

Abstract

The invention discloses an integral treatment method for drying and incinerating sludge. The integral treatment method includes steps of treating the original sludge by a dehydrator so that the moisture content of treated sludge ranges from 70% to 90%; atomizing the sludge with the moisture content ranging from 70% to 90%, treating atomized sludge by a spray dryer to obtain dry sludge and feeding tail gas generated by the spray dryer into a fluidized bed incinerator; feeding the dry sludge into fluidized bed incinerator to incinerate the dry sludge; and feeding flue gas generated in an incineration procedure of the fluidized bed incinerator into a flue after ash is separated from the flue gas by a separator, discharging a part of the flue gas in the flue, feeding another part of the flue gas into the spray dryer, enabling the ash to return the fluidized bed incinerator via a return feeder, and discharging slag generated in an incineration procedure of the fluidized bed incinerator via a slagging pipe. The integral treatment method has the advantages that a drying process and an incineration process which are independent from each other originally are organically combined with each other, waste heat generated in a drying procedure is effectively utilized, waste water and odor treatment systems are omitted, the cost is saved, pollution is obviously reduced, and the integral treatment method is favorable for environmental protection.

Description

technical field [0001] The invention relates to a sludge drying and incineration treatment method, in particular to an integrated sludge drying and incineration treatment method which organically combines two independent processes of sludge drying and incineration. Background technique [0002] In recent years, the construction speed of my country's sewage treatment plants is relatively fast, and a certain scale has been formed. Driven by the policy, local governments and enterprises have also been active in the construction of sewage treatment plants, but the investment over the years has basically not involved sludge treatment, so that if the sludge is not properly treated, it will lead to secondary pollution. Pollution makes sewage treatment meaningless to some extent. According to incomplete statistics, at present, by the end of 2010, a total of 2,832 urban sewage treatment plants have been built in China, with a sewage treatment capacity of 125 million cubic meters per...

AI Technical Summary

Problems solved by technology

[0005] At present, the method of sludge treatment and disposal that is widely used at home and abroad is the method of drying first and then incinerating, that is, the sludge is pretreated before being incinerated. The drying and incineration of sludge are composed of two basically independent systems. System is completed, the process is complex, the initial investment of equipment is high, and the sludge drying process also consumes a lot of energy, so the operating cost is high

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