Organic solid waste composite thermochemical treatment and utilization method

Abstract

The invention provides a composite thermochemical treatment and utilization method of organic solid waste, which comprises the following steps: pretreating the organic solid waste, pyrolyzing at low temperature, mixing the product and a gasifying agent in a high-temperature entrained-flow bed gasifier, gasifying and melting at high temperature, and generating high-temperature synthesis gas and slag; after the high-temperature synthesis gas is subjected to dust removal, waste heat gradient utilization or chilling, deamination and desulfurization, purified dry synthesis gas is obtained, one part of the purified dry synthesis gas is fed into a combustor, the other part of the purified dry synthesis gas is mixed with the high-temperature synthesis gas at an outlet of the gasification furnace for cooling, and the rest of the purified dry synthesis gas is subjected to high-value utilization; and chilling the high-temperature slag to form a glass body. The synthesis gas and the oxygen-enriched gas are combusted in the combustor to generate high-temperature flue gas to supply heat to the dividing wall of the pyrolysis reactor, after the exhausted flue gas is dried, one part of the flue gas is used as conveying gas, the other part of the flue gas is mixed with pure oxygen to prepare the oxygen-enriched gas, and the remaining part of the flue gas is directly subjected to carbon capture and storage. The method is clean, low-carbon, efficient and safe, and harmless treatment and resource utilization of large-scale solid waste can be achieved.

Description

technical field [0001] The invention relates to the field of harmless disposal and resource utilization of organic solid waste, especially organic hazardous solid waste. Specifically, it relates to a composite thermochemical treatment and utilization method of organic solid waste. Background technique [0002] The safe, clean, low-carbon and efficient disposal of organic solid waste has become a serious and urgent problem that plagues the healthy and rapid development of urban and industrial economies. Organic solid waste, especially organic hazardous solid waste, such as domestic waste, landfill waste, industrial sludge, fly ash, etc., will produce toxic and harmful substances such as heavy metals and dioxins, causing secondary pollution . [0003] Existing organic solid waste disposal technologies include sanitary landfill, composting, thermal drying-incineration, co-incineration, pyrolysis gasification, etc. With the saturation of the landfill and the shortage of land,...

AI Technical Summary

Problems solved by technology

Organic solid waste incineration is currently the most commercialized technical process, but the existing technology still has problems such as the prevention and control of secondary pollution in the process, the NIMBY effect, low public acceptance, and high requirements for environmental impact assessment; especially for organic hazardous solid waste, its Disposal requirements are more stringent. The residue after disposal must meet the glass state standard, and the content of dioxin and heavy metals must be strictly controlled to prevent secondary pollution. Disposal is extremely difficult

High-temperature melting is the development direction of advanced disposal of organic hazardous solid waste, but the current high-temperature melting technologies, such as plasma gasification and cement kiln collaborative technology, have problems such as high energy consumption, high cost, and small processing capacity, which limit their application.

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