Method of treating sludge by adopting self-propagating pyrolyzation device coordinated with cement plant

Abstract

The invention relates to the field of solid waste treatment, in particular to a method of treating sludge by adopting a self-propagating pyrolyzation device coordinated with a cement plant. The methodcomprises the following steps: by pyrolyzing sludge by means of the self-propagating pyrolyzation device, distributing the pre-treated sludge as a material on a chain belt / trolley below a distributorof the self-propagating pyrolyzation device to form a material bed; preheating the material bed by waste heat flue gas of the cement plant; then pyrolyzing the material bed by heat generated by combustion of fuel gas, wherein organic matters in the material bed form a gas compound; introducing the gas compound along with pyrolyzed flue gas into a decomposing furnace of the cement plant; then feeding the same into a flue gas purification system of the cement plant; and feeding the sludge ash residues formed by the pyrolyzed material bed as cement clinker into a cement clinker system. The method has the obvious advantages that a cement kiln is high in treatment temperature, large in incineration space, long in incineration standing time, large in treatment scale, free of secondary slag emission and the like. Meanwhile, the method also solves the problem of reconstruction cost and influence on production as a result of high water content of household sludge.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a method for treating sludge with a self-propagating pyrolysis device in a collaborative cement plant. Background technique [0002] With the continuous increase of urban population and the improvement of domestic sewage treatment rate, the generation of municipal sewage sludge has increased accordingly, so the environmental pollution of municipal sludge has become the focus of the general public. Municipal sludge is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc., containing a large number of pathogenic bacteria, parasites (eggs), some heavy metals, salts and other toxic and harmful substances. Highly attached and bound water. Although the sewage treatment plant has adopted methods such as vacuum filtration or centrifugal dehydration for dehydration, the moisture content of the sludge is still as high ...

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Problems solved by technology

[0004] In order to make use of the remarkable advantages of the cement kiln itself, such as high processing temperature, large incineration space, long incineration residence time, large processing scale, and no secondary slag discharge; In order to solve the problems of reconstruction cost and production impact, the present invention provides a method for cooperating with cement plants to treat sludge with self-propagating pyrolysis devices. This method can effectively combine with existing cement plants to realize the treatment of domestic sludge without affecting cement The working conditions of the plant, the cost of cement kiln transformation is low

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