Method for pyrolyzing municipal sludge and preparing biological oil and active carbon simultaneously

Abstract

The invention discloses a method for pyrolyzing municipal sludge and preparing biological oil and active carbon simultaneously, which can obtain high-quality biological oil and active carbon simultaneously and solves the problem that the conventional sludge pyrolysis method only can obtain a single recycled product. In the method, sludge (A) enters a pyrolysis reactor (1) through a vane feeder (1-1); fluidized wind (B) enters the pyrolysis reactor (1) through a wind chamber (1-2) and a wind distribution plate (1-3); a cyclone separator (2) catches and collects fallen pyrolytic carbon (C) and returns the pyrolytic carbon (C) to the pyrolysis reactor (1) for circulation through a blank pipe (3), a material feedback device (4) and a material returning pipe (5); the pyrolytic carbon (C) becomes active carbon (D) after repeated circulation; and then, the active carbon (D), together with pyrolytic gas (E), enters a ceramic filter (8) and is caught and collected by the ceramic filter (8); the pyrolytic gas (E) discharged by the ceramic filter (8) enters a condenser (9); and the lower part of the condenser recovers biologic oil (H) and discharges noncondensing gas (I).

Description

technical field [0001] The invention relates to a technology for simultaneously preparing bio-oil and activated carbon by low-temperature pyrolysis of urban sludge, and belongs to the field of solid waste resource disposal. Background technique [0002] According to the "Decision of the State Council on Implementing the Scientific Outlook on Development and Strengthening Environmental Protection", the urban sewage treatment rate will not be lower than 70% in 2010, and the output of urban sludge will be 4.18 million tons (equivalent to 20.9 million tons of sludge with a moisture content of 80%) . With the continuous expansion of the scale of urban sewage treatment, the degree of sewage treatment has increased year by year, and the sludge production has also increased sharply. At present, 83% of the sludge in urban sewage treatment plants with a national sewage treatment capacity of 200,000 t / d or more has not been properly disposed of, and there is no certain guarantee for t...

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Problems solved by technology

[0007] Technical problem: Aiming at the high cost of sludge disposal and the problem that ordinary sludge pyrolysis technology can only obtain a single resource-based product, this invention proposes a high-rate circulating fluidized bed sludge low-temperature pyrolysis technology, the purpose of which is to provide a A low-temperature pyrolysis method that can simultaneously obtain high value-added bio-oil and activated carbon

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