Steam heat pipe drying method and system for sewage sludge

Abstract

The invention discloses a steam heat pipe drying system for sewage sludge, which comprises a steam generator, the bottom of the steam generator is provided with the external heat source; deionized water is pumped into the steam generator from the lower portion of the steam generator; the steam generator above the deionized water is provided with the drying apparatus; the upper end of the drying apparatus is connected with a sludge bin; the drying apparatus is provided with a stirrer; the bottom of the drying apparatus is connected with an outlet of the dried sludge; the other side of the upper end of the drying apparatus is connected with a spraying cooling tower through pipes; the top of the spraying cooling tower is provided with a spraying opening; the bottom of the spraying cooling tower is provided with a wastewater outlet; and the praying cooling tower is connected with an exhaust purifier.

Description

technical field [0001] The invention relates to a new method for cleaning and drying sewage sludge, in particular to a sludge steam high-efficiency drying system with simple structure, easy operation and continuous and stable operation. Background technique [0002] According to the "China Statistical Yearbook", in 2010, the amount of urban domestic sewage generated was 37.98 billion cubic meters, and the annual discharge of industrial sewage also reached 23.75 billion cubic meters. Sludge is the solid sediment produced during sewage treatment. The water content of raw sewage sludge can reach 99%, and the main components of mechanically dewatered sludge are about 80% water, 10% organic matter and 10% ash. Every year, the wet sludge produced by my country's sewage treatment can reach more than 60 million tons (85% moisture content). Sludge contains a large amount of harmful substances, such as heavy metals, bacteria, various parasite eggs, a large number of pathogenic micr...

AI Technical Summary

Problems solved by technology

[0004]1. The high water content of sludge makes the drying process require a lot of energy and high cost;

[0005]2. Due to the bonding of the heating surface during the sludge drying process, the drying effect is not ideal;

[0006]3. The sludge drying process will also produce stench, etc., which will pollute the surrounding environment

[0007] The disorderly stacking and unreasonable treatment of sludge not only takes up a lot of land, but also pollutes land and water bodies, and is prone to corruption, resulting in stench and air pollution

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