Method using drying and incineration to treat sludge

Abstract

The invention discloses a method using drying and incineration to treat sludge. The method includes: the pre-dewatered sludge of a sewage treatment plant is conveyed into a sludge bin, with an arch breaking function, of a system, then the sludge is conveyed to a horizontal stirring sludge drying machine through a sludge pump, and the sludge is subjected to stirring and indirect heat exchange to remove moisture and increase heat value and conveyed into a fluidized bed incinerator for incineration; smoke generated by the incineration is subjected to pre-dust-removing by a high-temperature separator and conveyed into a waste heat boiler system so as to recycle heat serving as the heat source of the drying machine, the processed smoke is conveyed into a preheater to preheat air entering the fluidized bed incinerator, and then the smoke enters a cloth-bag dust remover and is processed by a washing tower and discharged in a standard-reaching manner through a chimney; the tail gas generated by the drying machine is subjected to moisture recycling by a condenser and dust removing and then conveyed into the fluidized bed incinerator; fly ash is collected by a pneumatic conveying system to serve as a construction raw material. The method has the advantages that stable, harmless and recycling type sludge treatment can be achieved by the incineration of the dried sludge, the system effectively utilizes the incineration heat to serve as the heat source of the drying machine, and the smoke generated by the incineration is effectively treated and discharged in a standard-reaching manner.

Description

technical field [0001] The invention relates to the technical field of sludge disposal, in particular to a sludge drying and incineration disposal method. Background technique [0002] Sludge incineration is a disposal method that uses an incinerator to oxidize organic matter in sludge at high temperature under aerobic conditions to completely mineralize it into ash. Sludge is directly incinerated, because of its high moisture and low calorific value, it needs to supplement a large amount of fossil fuels, which greatly increases the cost of sludge disposal. The flue gas after sludge incineration contains a certain amount of harmful substances, such as hydrogen chloride, sulfide, heavy metals, dioxins, etc. Therefore, without a reasonable dry incineration process and device, incineration is a disposal method that cannot be accepted by people and the natural environment. [0003] The traditional incinerator is mainly a circulating incinerator, and the bed material is in a vi...

AI Technical Summary

Problems solved by technology

The power consumption of the device is large, and the wear and tear on the equipment is serious, and most of the incinerators are equipped with metal heat exchange tubes or other forms of metal heating surfaces. Life expectancy is severely affected

[0004] Traditional incineration flue gas treatment follows the methods and devices used in coal-fired thermal power plants, with backward technology and low efficiency

For example, limestone / gypsum wet method is mostly used, natural limestone resources are limited, the cost is high, and by-products cause secondary pollution

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