Urban sludge low-temperature hydrothermal carbonization coal production recycling system

Abstract

The invention discloses an urban sludge low-temperature hydrothermal carbonization coal production recycling system which greatly improves the combustion value of biochar and enhances the sludge incineration efficiency through a vacuum drying and squeezing system. A phosphorus recovery device is added to recover phosphorus in sewage and develop the additional value of phosphorus. The integrated system comprises a feeding system, a carbonization system, a heat exchange system, a discharging system, a dehydration system, a dosing system, a phosphorus recovery system, an automatic control systemand the like, and is characterized in that the excess sludge is converted into green fuel (charcoal), and phosphorus is recovered, so that the excess sludge is harmless, stable, reduced, recycled, economical and efficient. According to the technology, urban sludge low-temperature hydrothermal carbonization coal production recycling is provided, and sludge is pyrolyzed in an anaerobic environment to produce biochar. The biochar formed after hydrothermal carbonization and vacuum drying and squeezing is high in combustion value, environmentally friendly, high in resource utilization rate and remarkable in energy conservation.

Description

technical field [0001] The invention relates to the field related to sludge carbonization treatment, in particular to an integrated system for low-temperature hydrothermal carbonization of urban sludge for coal production and resource utilization. Background technique [0002] About 40% of the pollutants in the sewage treatment process end up in the sludge. The huge sludge production and the lack of economical, safe and efficient sludge disposal methods make a large amount of sludge produced every year have a huge impact on the environment. Sludge The corruption and deterioration of a large amount of organic matter in the mud will cause foul odor in the water body, and the nitrogen and phosphorus elements contained in it will also lead to eutrophication of the water body and damage the ecological environment. [0003] Sludge contains a large amount of carbon, which is derived from carbon dioxide in the atmosphere and is an important link in the carbon cycle of the biosphere....

AI Technical Summary

Problems solved by technology

At present, the main method of sludge recycling is drying and incineration. Its main feature is its low combustion value, which has a direct impact on the power generation of power plants and waste-to-energy plants. At the same time, deodorization and tail gas treatment are required. The mud way out has certain limitations

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