Sludge incineration method and sludge incineration facility

Abstract

The invention provides a sludge incineration method and a sludge incineration facility adopting the same. The sludge incineration method includes the following steps: a sludge incinerator is utilized to incinerate half-dried sludge dried by a steam type sludge drier, the heat of the steam condensate of the steam type sludge drier is recovered, the recovered heat is utilized to preheat the normal-temperature air, so that the first preheated air is obtained, the heat of the exhausted gas of the sludge incinerator is recovered, the recovered heat is utilized to heat the first preheated air which is already preheated, so that the heated air is obtained, the heated air is used as the combustion air and supplied to the sludge incinerator, and moreover, according to the character of the half-dried sludge, the temperature of the combination air is regulated by increasing and decreasing the amount of the steam condensate. When the sludge incineration method is adopted, the temperature of the heated air not only can be regulated but also can reach a higher level, and the sludge incineration method can meet the incineration requirement of various types of sludge with shapes varying in a wide range.

Description

technical field [0001] The invention relates to a sludge incineration method and sludge incineration equipment adopting the sludge incineration method. Background technique [0002] For the purpose of protecting the environment and saving costs, most of the dry incineration systems for sewage sludge currently require to reduce the use of auxiliary fuel and perform "spontaneous combustion operation" when incinerating sludge. In order to establish spontaneous combustion, it is not enough to blow air into the sludge incinerator, but also to control the temperature in the incinerator by blowing in preheated air to meet the needs of the sludge in the furnace to maintain spontaneous combustion. Before incinerating the sludge, use the drying system to dry the dewatered sludge into semi-dry sludge, which can reduce the load on the incinerator. In China, due to the relatively low calorific value of sludge and the wide range of changes in the properties of different sludges such as w...

AI Technical Summary

Problems solved by technology

These two heating methods have their own advantages and disadvantages. When steam is used as the heat source, the preheating temperature can be adjusted by adjusting the supply of steam, but it is difficult to achieve a higher preheating temperature due to the limitation of the temperature of the steam or steam condensate itself. Meet the temperature requirements of the spontaneous combustion operation of sludge with low calorific value; when the exhaust gas of the sludge incineration system itself is used as the heat source, a higher preheating temperature can be obtained, but it is difficult to adjust the preheating temperature, so it is difficult to carry out effective temperature control

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