System and method for treating solid wastes

Abstract

The invention discloses a system and method for treating solid wastes. The system comprises a pre-treatment unit, a drying unit, a pyrolyzation unit, a purifier, a burner and a screening unit, whereinthe pyrolyzation unit comprises an internal cylinder, a secondary external cylinder and an external cylinder. The internal cylinder is rotationally arranged, a pyrolyzation space is formed in the internal cylinder, a helical blade is arranged on the inner wall of the internal cylinder, a drying material inlet is formed in the front end of the internal cylinder, and a solid material outlet is formed in the rear end of the internal cylinder. The internal cylinder is sleeved with the secondary external cylinder to form a gasification space, a pyrolytic oil gas pipeline and an atomized water pipeline are arranged in the gasification space, one end of the pyrolytic oil gas pipeline is communicated with the pyrolyzation space, the other end of the pyrolytic oil gas pipeline extends into the gasification space, and a gasified gas outlet is formed in the portion, at the other end away from the pyrolytic oil gas pipeline, of the secondary external cylinder; the secondary external cylinder is sleeved with the external cylinder to form a heat exchange space, a high-temperature flue gas inlet and a heat-exchange flue gas outlet are formed in the heat exchange space, and the heat-exchange fluegas outlet and a drying cold air outlet are connected with a drying hot air inlet.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization, and in particular relates to a system and method for treating solid waste. Background technique [0002] Making municipal solid waste into pyrolytic charcoal through anaerobic high-temperature pyrolysis has good effects in terms of reduction, harmlessness, and resource utilization, and is considered to be a promising way of municipal solid waste disposal. The biochar produced by pyrolysis has the advantages of large specific surface area and large porosity. It is a relatively good building material and soil conditioner, and has a wide application prospect. However, the utilization of pyrolysis oil and gas is relatively complicated. At present, the commonly used methods are: (1) directly enter the burner after being fired to generate flue gas, and reuse it in the system; Preparation of clean fuels and chemicals. However, the current utilization method still has certain technical ...

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Problems solved by technology

Therefore, an object of the present invention is to propose a system and method for treating solid waste. This system not only effectively solves the problem of pipeline coking and direct combustion caused by the export of pyrolysis oil and gas in the pyrolysis stage of the existing solid waste treatment process. Toxic substances such as dioxins or oily wastewater caused by water washing are difficult problems, and realize the resource utilization of organic solid waste and reduce costs

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