System and method for gasifying and melting solid wastes

Abstract

The invention discloses a system and a method for gasifying and melting solid wastes, and belongs to the technical field of environmental protection. The system comprises a solid waste feeding unit, acirculating fluidized bed gasifying unit, an entrained flow bed gasifying and melting unit, a waste heat recovery and dust removal unit and a gasified gas purification unit which are sequentially connected, the waste heat recovery and dust removal unit comprises a gasification agent preheater, a waste heat boiler, a dust remover and a gas cooler which are connected in sequence, a fly ash circulation pipeline is connected to the bottom of the dust remover, the fly ash circulation pipeline is provided with a returning unit, the circulating fluidized bed gasifying unit comprises a circulating fluidized bed gasifying furnace and a circulating fluidized bed gas-solid separator, and the returning unit is connected with the returning port of the circulating fluidized bed gas gasifying furnace. The system and the method can realize the large-scale industrial processing scale of solid wastes, and solve the problems of high energy consumption, low thermal efficiency, low gasification efficiency, poor adaptability of raw materials, incomplete harmless treatment of ash and slag, and easy entrainment of harmful substances in the smoke in existing solid waste treatment methods.

Description

technical field [0001] The invention relates to a solid waste gasification melting system and method, belonging to the technical field of environmental protection. Background technique [0002] With the implementation of increasingly stringent environmental protection policies and regulations, how to realize the reduction, recycling, The goal of harmless treatment is an important research content in the field of environmental protection technology in recent years. [0003] Traditional solid waste disposal methods include landfill and incineration. Due to the large landfill method, it is very easy to cause secondary pollution to groundwater and soil, and cannot achieve the goal of reducing, recycling, and harmless treatment of solid waste, and has been phased out. The incineration method requires high calorific value of solid waste. Low calorific value or unstable calorific value will easily lead to incomplete incineration and strong carcinogens such as dioxins; the residue...

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Problems solved by technology

[0008] In view of the existing solid waste treatment methods, there are high energy consumption, low thermal efficiency, low gasification efficiency, poor raw material adaptability, incomplete ash and residue harmless treatment, and harmful substances (tar, phenol, dioxins) are easily entrained in the flue gas. etc.), it is difficult to realize the problem of large-scale industrialized treatment scale, the present invention provides a solid waste gasification melting system and method

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