Sludge conditioning dehydration coupling carbonization reduction treatment method and system

Abstract

The invention discloses a sludge conditioning dehydration coupling carbonization reduction treatment method. The method comprises the following steps: A, flue gas flow, to be more specific, hot flue gas enters a pyrolysis carbonization system to indirectly heat sludge, heat is absorbed by the carbonization process, discharged flue gas enters a thermal drying dehydration system, the sludge is dried, and tail gas carrying a small amount of dust enters a cyclone dust collector to be subjected to solid-gas separation, enters a deodorization device through a desulfurization and denitrification system and a system induced draft fan to be deodorized and purified, and then is discharged after reaching the standard; and B, a sludge process, to be more specific, wet sludge is sent to a conditioningtank for homogeneous conditioning, to a mechanical filter pressing device for filter pressing, to a semi-dry sludge bin, to a sludge thermal drying dehydration system via a sludge buffer hopper, and to a pyrolysis carbonization system after directly contacting with hot flue gas for heat exchange, the sludge is indirectly heated and carbonized by the high-temperature flue gas, organic matters in the sludge are precipitated in volatile forms, residual water is evaporated and precipitated, the sludge forms sludge carbon in the pyrolysis carbonization system, and after cooling, the sludge is sentto a finished product bin for loading and outward transportation.

Description

technical field [0001] The invention relates to the field of solid waste treatment and resource utilization, in particular to a sludge conditioning and dehydration coupled carbonization reduction treatment method and system. Background technique [0002] With the rapid development of my country's social economy and urbanization process, the scale of urban sewage treatment and industrial wastewater treatment continues to expand, and the amount of sludge generated has also increased significantly. It is estimated that by 2020, the annual output will reach 60 million tons (water content 80%) Sludge, meanwhile, continues to grow at a growth rate of 15%. Sludge has the characteristics of high yield, high water content and high pollution. At the same time, sludge contains harmful components such as pathogenic bacteria, antibiotics and heavy metals. The existing conventional treatment methods are as good as Oxygen composting, anaerobic biogas production, etc. are difficult to complet...

AI Technical Summary

Problems solved by technology

The patent application is a process of direct contact between steam and sludge for thermal hydrolysis followed by pressure filtration and dehydration, which increases the energy conversion of steam and lowers thermal efficiency, and the thermal hydrolysis reactor can only feed intermittently and discharge intermittently, and cannot continue Production

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