Garbage pyrolysis and gasification system device with drying function and garbage pyrolysis and gasification method

Abstract

The invention provides a garbage pyrolysis and gasification system device with a drying function and a garbage pyrolysis and gasification method. The device comprises a pyrolysis and gasification unit, a secondary combustion chamber and a waste heat utilization unit which are sequentially connected in the smoke flowing direction, wherein the pyrolysis and gasification unit comprises three pyrolysis and gasification furnaces, which are respectively marked as a first gasification furnace, a second gasification furnace and a third gasification furnace; and the first gasification furnace, the second gasification furnace and the third gasification furnace are respectively connected with the secondary combustion chamber. According to the invention, garbage can be prevented from being stacked in the pyrolysis and gasification furnaces to build a shed, uniform material distribution in the gasification furnaces is realized, the garbage is prevented from being coked on a fire grate, and the pyrolysis and gasification efficiency is improved. Secondary air entering the secondary combustion chamber is evenly distributed, the gas retention time is prolonged, combustible components in gas are thoroughly combusted, harmful substances in the gas are thoroughly decomposed, emission reaches the standard, secondary pollution is avoided, and high organic decrement rate and harmlessness of residual ash are achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and relates to the technical field of garbage treatment, in particular to a garbage pyrolysis gasification system device and method. Background technique [0002] With the popularization of global urbanization, the pace of life is accelerating, and domestic garbage is increasing, which has become the most serious environmental problem in our country and even in the whole world. At present, the global waste disposal methods mainly include: landfill, incineration and composting. Among them, the incineration treatment of garbage is to burn combustible solid waste and oxygen in the air at high temperature to oxidize and decompose it, which can successfully reduce the volume by about 90%. The incineration treatment technology is characterized by large processing capacity, good capacity reduction, complete harmlessness, and heat recovery. However, the limitation of incineration technolog...

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Problems solved by technology

[0003] The waste pyrolysis gasification system of the prior art has the following disadvantages in operation: (1) The system has high requirements on the calorific value and moisture content of the raw waste, and the waste needs to be sorted, dried and other pretreatment processes, which increase the pretreatment Cost; (2) Garbage accumulation often occurs in the pyrolysis and gasification chamber, with uneven distribution, insufficient pyrolysis and gasification, and easy coking on the grate. , affect the efficiency of pyrolysis and gasification, coke cannot be unloaded, and the device cannot operate continuously; (3) The structure of the secondary combustion chamber is simple, which is not conducive to the separation of smoke and dust. At the same time, the residence time of combustible gas in the secondary combustion chamber is short, and the combustion effect is not ideal. , and dioxin-like harmful substances cannot be completely decomposed, resulting in the failure of the flue gas to meet the standard; (4) The project construction period is long and the flexibility of the equipment is poor

[0008] The garbage pyrolysis and gasification system reported above can effectively pyrolyze and gasify garbage. However, there will be uneven cloth distribution during the combustion process, and the utilization rate of waste heat generated by the burner is not high, wasting resources, and the economic benefits are low. Low

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