Urban organic solid waste coupling dry pyrolysis gasification system

Abstract

The invention relates to an urban organic solid waste coupling dry pyrolysis gasification system, which comprises a sludge feeding storage device, a pre-drying device, a cyclone separator, a sludge special cloth bag and a smoke gas afterheat recovery device in sequential connection, wherein the cyclone separator and a sludge outlet of the special sludge cloth bag are connected with a cyclone fluidized bed gasification furnace; the cyclone fluidized bed gasification furnace is connected with a high-temperature separator; the high-temperature separator is connected with a second combustion chamber; high-temperature smoke gas generated by the second combustion chamber is used as a heat source of the pre-drying device; ash slag generated by the high-temperature separator and the second combustion chamber is fed into an ash slag cabin after being cooled by a cold slag conveying machine. Through the integration and the optimization by the system, a pre-drying and pyrolysis gasification two-section process is used; the process controllability and the operability are high. Compared with a conventional fixed bed or steam drying and fluidized bed gasification combination process, the processhas the advantages that the heat efficiency is improved by 10 to 15 percent. The sludge is subjected to pyrolysis gasification, so that the exhaust of harmful substances and NOx and Sox can be greatly reduced through being compared with the exhaust value of direct combustion; the tail gas treatment cost is reduced.

Description

technical field [0001] The invention relates to the field of ecological environmental protection, and more specifically relates to a coupled drying pyrolysis gasification system for urban organic solid waste. Background technique [0002] It is predicted that the sludge output of urban sewage plants will reach more than 80 million tons in 2020. Sludge has a high water content, is perishable and has a strong odor, and contains a large number of pathogenic bacteria, parasite eggs, heavy metals such as chromium and mercury, and toxic, harmful and carcinogenic substances that are difficult to degrade, such as dioxin. How to treat sludge in a harmless and resourceful way is a major environmental protection issue. [0003] Solving the sludge problem should be "disposal-based treatment". The sludge disposal methods mainly include sanitary landfill, land use, production of building materials, and incineration. The application of sanitary landfill is decreasing due to problems such...

AI Technical Summary

Problems solved by technology

[0005] At present, conventional equipment such as externally heated rotary furnaces and fixed beds are mostly used for pyrolysis and gasification of organic solid waste such as sludge, which do not match the characteristics of high ash content and low ash melting point of dewatered sludge, and the gasification yield is low (< 50%) gasification is not complete

AG's Balingen sludge gasification project in Germany and Japan's Tokyo Metropolitan Sewerage Bureau have developed a system that utilizes dry sludge gasification to generate gas for power generation. Both use steam pre-drying. The system is complex, the energy conversion chain is long, and the heat loss is large, which has not been realized. True coupling of drying and pyrolysis gasification

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