Municipal refuse treatment device and method

Abstract

The invention discloses a municipal refuse treatment device and a municipal refuse treatment method. A primary selection machine, a coarse crusher, a primary dehydrator, a winnowing machine, a primary metal sorting machine, a screening machine, a fine crusher, a secondary dehydrator, a secondary metal sorting machine, a mixer, a refuse derived fuel (RDF) molding machine and a drying machine are sequentially connected in series between a feeder and an RDF racking machine, wherein the screening machine is connected with an anaerobic generator; a stable dehydrator is connected in series between the anaerobic generator and a biochemical treater; the bottoms of the primary dehydrator and the second dehydrator are provided with water outlets, and the water outlets are connected with a water inlet of the anaerobic generator through a pipeline; and a methane purifier, a gas storage tank and a methane boiler are sequentially connected in series between the anaerobic generator and hot air of the drying machine. Due to a two-stage dehydration mode, a thermal load of the drying machine is effectively reduced before refuse enters the drying machine, and the consumption of external energy is effectively reduced; and moreover, in the process of anaerobic reaction, the chemical oxygen demand (COD) of the effluent is reduced, and the pressure of a subsequent biochemical reactor is reduced.

Description

technical field [0001] The invention belongs to the technical field of garbage recycling, and relates to a garbage treatment device and method, in particular to a device and method for converting municipal garbage into garbage-derived fuel. Background technique [0002] In 2008, about 155 million tons of urban domestic garbage were collected and transported in my country, and about 70 million tons of domestic garbage were collected in counties and towns. Urban domestic waste is increasing rapidly at an average annual rate of 4-8%. Garbage besieged cities have become the status quo in most cities in my country. The accumulation of urban domestic waste occupies a large amount of land and causes serious environmental pollution; realize its harmlessness and reduction It is imminent to transform and recycle resources. [0003] At present, the common treatment methods of municipal solid waste include the following: [0004] Landfill method: This is the main treatment method curre...

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Problems solved by technology

[0008] However, there are still some problems to be improved in the conversion of municipal waste into RDF: 1) Many processes do not consider the drying of RDF. If the water content in RDF is too high, the calorific value will be directly reduced, and even the combustion characteristics will deteriorate sharply; or , the conventional drying method used in some processes consumes a lot of energy. For example, in the production experiment of the Institute of Engineering Thermophysics of the Chinese Academy of Sciences, the drying accounted for more than half of the cost of drying. Japan uses kerosene to burn and dry RDF in RDF production. It takes 1 ton of garbage to process It consumes 56kg of kerosene. If direct combustion of RDF is used for drying, the RDF loss will reach 10%~15%; 2) Most of the permeate treatment only considers the removal of its polluting components, but does not consider the reuse of permeate

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