Sludge burning treatment method and system

Abstract

The invention relates a treatment method and system for burning sludge, which comprises: conveying the dewatered sludge in moisture percentage of 75-85 % into a combustion chamber of a circulating fluidized bed, and conveying the contaminated gas produced in storing process into the combustion chamber of the circulating fluidized bed, burning the dewatered sludge, contaminated gas and coal together, the end gas discharges by processing. The system comprises circulating fluidized bed boiler, ash separator and sludge storeroom, conveying the dewatered sludge through a sludge carrier pipe and a sludge spraying cap using a screw pump, emitting the sludge into the combustion chamber of the circulating fluidized bed and burning, conveying the said contaminated gas into the chamber of the circulating fluidized bed too. The system also has a steam purging unit and a water high pressure unit which clean the screw pump, sludge carrier pipe and sludge spraying cap nontiming to prevent the clogging by dewatered sludge.

Description

technical field [0001] The invention relates to a sludge incineration treatment method and a sludge incineration treatment system, in particular to a method and a system for incineration treatment of sludge by using a circulating fluidized bed. Background technique [0002] At present, the treatment methods of the dewatered sludge obtained after the sewage treatment by urban sewage plants mainly include sanitary landfill, land use, and dry incineration. [0003] The sanitary landfill of sludge began in the 1960s and was developed from the perspective of protecting the environment on the basis of traditional burial. It mainly involves strict scientific analysis of the landfill and necessary site protection treatment. So far, it has developed into a relatively mature sludge treatment technology, which has the advantages of low investment, large capacity and quick results. However, there are many problems in the sanitary landfill of municipal sludge: various toxic substances i...

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Problems solved by technology

However, there are many problems in the sanitary landfill of municipal sludge: various toxic substances in the landfill are eroded and leaked by rainwater, so that some pollutants in the sludge enter the deep layer of the ground and pollute the groundwater environment, so sanitary landfill The sludge treatment method is extremely unsafe for areas where groundwater is the domestic water source; in addition, the sites suitable for landfilling sludge are also becoming less and less due to the large output of urban sludge, and the various costs of the site also getting higher

The advantage of the dry incineration method is that there are few residues produced by incineration, and the ash after incineration has no peculiar smell; however, the investment in the treatment equipment for dry incineration is huge, the operating cost is high, and a large amount of waste gas is generated, so the dry incineration of sludge is mainly used In the following cases: the quality of the sludge is too poor or the sludge output is too large or the existing landfill site is insufficient

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