Sludge drying system and using method thereof

Abstract

The invention relates to a sludge drying system and a using method thereof. The system is characterized by comprising a sludge drying incineration loop, a conduction oil heat supply circulation loop and a high temperature smoke loop, wherein the sludge drying incineration loop comprises a dry sludge back-mixing device, a sludge drier, a sludge incinerator, a dry sludge storage bin and a dry sludge regulating valve; the conduction oil heat supply circulation loop comprises a conduction oil pump, a solar thermal collector, a solar radiation survey meter, a high temperature heat exchanger and two conduction oil regulating valves; and the high temperature smoke loop comprises an air blower. The sludge drying method comprises the following steps: firstly, drying wet sludge in the sludge drier to obtain dried sludge; returning and inputting the sludge to the sludge back-mixing device; mixing and re-inputting the dried sludge and the wet sludge to the sludge drier for drying; incinerating the dried sludge in the sludge incinerator, wherein heat energy released by high temperature smoke which is generated by incineration provides energy for drying with solar energy so as to avoid primary energy consumption. The system and the method can be widely applied to sludge drying treatment engineering.

Description

technical field [0001] The invention relates to a sludge treatment system and its use method, in particular to a sludge drying system using solar energy auxiliary heating and its use method. Background technique [0002] According to statistics, as of February 2009, my country has produced nearly 100,000 tons of sludge per year. Based on the daily wet sludge output of currently operating sewage treatment plants, it is estimated that by the end of 2010, my country's daily wet sludge output will reach at least 175,000 tons. . Compared with the huge amount of sludge production, the harmless treatment rate of sludge in my country is very low. In the prior art, a mechanical dehydrator is usually used to dehydrate the sludge with a water content higher than 80%; however, it is difficult to dehydrate the sludge with a water content lower than 80% by a mechanical dehydrator. The treatment method is to remove the water by heating and evaporating. This requires a large amount of ene...

AI Technical Summary

Problems solved by technology

This requires a large amount of energy consumption. Although the energy generated by sludge incineration can be recovered to supplement the energy consumed in the drying process, the heat released by the incineration of sludge is still not enough to provide all the energy required for the drying process. Therefore, it is necessary to add auxiliary heat source

The current dry incineration device uses natural gas as auxiliary energy, which virtually increases the operating cost, and the combustion of natural gas releases a large amount of polluting gas, which is not conducive to environmental protection

Images