Fluidization heat accumulation type sludge low-temperature catalytic pyrolysis method and device thereof

Abstract

The invention discloses a fluidization heat accumulation type sludge low-temperature catalytic pyrolysis method. The method comprises the following steps: A, sludge is pyrolyzed to produce gas; B, pyrolysis gas is recycled; and C, the residual heat produced by waste gas combustion is utilized. The invention also discloses a fluidization heat accumulation type sludge low-temperature catalytic pyrolysis device. On one hand, the pyrolysis gas produced by the pyrolyzed sludge is enabled to pass through an air preheater, so that the heat is recycled, and then the pyrolysis gas is condensed by a condenser to obtain tar, and the pollution to the environment due to gas emission is avoided; on the other hand, the pyrolysis waste is directly discharged and collected, the structure is simple, the operation is convenient and the potential safety hazard is also reduced. According to the invention, the fluidization, the pyrolysis of heat accumulation particles and the residual heat produced by pyrolysis gas and waste gas combustion are comprehensively utilized, and tar is also prepared, so that the efficient utilization of energy and resource of sludge and the environmental protection are realized.

Description

technical field [0001] The invention relates to a low-temperature catalytic pyrolysis method and device for solid waste, in particular to a low-temperature catalytic pyrolysis method and device for fluidized heat storage sludge. Background technique [0002] Sludge (Sewage Sludge, SS) generally refers to the mixture or colloid of solids and water deposited in the drainage pipes and channels produced during the water treatment process. An extremely complex heterogeneous body composed of other components. With the acceleration of urbanization and industrialization in my country, the discharge of urban sewage and industrial sewage is increasing. According to the 2010 China Environmental Status Bulletin, 22 million tons of sludge are generated every year, 80% of which have not been effectively treated. Because sludge enriches pollutants in sewage, it contains a large number of toxic and refractory substances such as virus microorganisms, parasite eggs, heavy metals, dioxins, an...

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Problems solved by technology

For example: in the process of digestion and conditioning of sludge, a large amount of NH should be discharged 4 、H 2 S, CH 4 , odor and other gaseous pollutants, which will have a negative impact on the environment; in the process of sludge concentration, a large amount of chemicals and part of power will be consumed, which will increase the cost of sewage treatment plants; in the process of sludge dehydration, not only A large amount of power consumption, and there are problems such as low equipment automation, heavy maintenance workload, and high sanitation risk, and its economic cost cannot be underestimated; in the sludge drying process, not only the energy consumption and cost are higher, but also the output Malodorous gases are difficult to deal with; in addition, problems such as land occupation and investment of sludge treatment facilities have not been solved in practice

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