Sectional sludge drying system

Abstract

The invention relates to the field of sludge treatment, and particularly relates to a sectional sludge drying system. The sectional sludge drying system comprises a sludge pressing mechanism for dewatering sludge, an extrusion forming mechanism, a transport mechanism, a steam drying mechanism for primarily drying the sludge, a heat pump drying mechanism for secondarily drying the sludge, and a high-temperature pyrolyzing mechanism for pyrolyzing the sludge at a high temperature; and the extrusion forming mechanism is disposed below the sludge pressing mechanism, the transport mechanism is disposed below the extrusion forming mechanism, the steam drying mechanism and the heat pump drying mechanism, the transport mechanism is connected with the steam drying mechanism by virtue of a first gas inlet pipeline and a first gas outlet pipeline, the transport mechanism is connected with the heat pump drying mechanism by virtue of a second gas inlet pipeline and a second gas outlet pipeline, and one end, away from the extrusion forming mechanism, of the transport mechanism is connected with the high-temperature pyrolyzing mechanism. The sectional sludge drying system is energy-saving, environmentally friendly, capable of circularly supplying the gas, capable of treating the sludge by virtue of dry hot air, and high in drying efficiency.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a segmented sludge drying system. Background technique [0002] With the improvement of China's urbanization level, the amount of urban sewage treatment is increasing, and the amount of sludge that needs to be safely treated is increasing day by day. As of the end of March 2014, a total of 3,622 sewage treatment plants have been built in cities and towns in my country, with a sewage treatment capacity of about 153 million m3 / d, and the output of sludge with a moisture content of 80% has exceeded 30 million tons; in 2015, my country's annual sludge output (80 % water content) reached 33.59 million tons; it is estimated that by 2018, the sludge output with 80% water content will further exceed 40 million tons. [0003] As a follow-up product of sewage treatment, sludge is actually the concentration of pollutants in sewage. It has the characteristics of high water content, complex co...

AI Technical Summary

Problems solved by technology

[0004] Traditional sludge treatment includes incineration, landfill, composting, etc. Incineration is not economical due to the high moisture content of sludge and is prone to produce dioxins and other substances. Landfilling occupies land and is likely to cause secondary pollution. The sludge contains heavy metals Not suitable for direct composting

[0005] Therefore, in the prior art, the drying equipment is generally used to remove the moisture in the sludge, specifically, the drying wind is blown to the surface of the sludge to accelerate the air flow on the surface of the sludge, so that the moisture of the sludge can be evaporated, but on the one hand, In the process of drying air generation, the fresh air comes from the outside, and the humid cold air obtained after drying is directly discharged, which is not conducive to energy conservation and environmental protection, and does not realize gas circulation. Second, relying solely on the method of accelerating air flow on the sludge surface is harmful to sludge Drying, drying efficiency is low

In the third aspect, more than one method is used for drying, which is not conducive to energy saving and environmental protection

Images