Pyrohydrolysis method of sludge

Abstract

The invention discloses a pyrohydrolysis method of sludge. The pyrohydrolysis method comprises the following steps: quickly and fully mixing sludge to be treated with steam, wherein introducing the sludge to be treated with a certain pressure into a first inlet of a steam sludge ejector, meanwhile, introducing steam with a certain pressure and temperature into a second inlet of the steam sludge ejector, and rapidly and fully mixing the sludge to be treated and the steam in the steam sludge ejector and then introducing an obtained mixture into a sludge pyrohydrolysis pipeline; carrying out pyrohydrolysis in the sludge pyrohydrolysis pipeline, wherein controlling the pyrohydrolysis temperature in the sludge pyrohydrolysis pipeline to be 110-225 DEG C, the pressure to be 0.5-3 Mpa, the reaction time to be 0.1-1 hour, and discharging the sludge obtained through pyrohydrolysis through a pressure relief discharger at a sludge outlet. The pyrohydrolysis method of sludge can quickly realize full mixing of steam and sludge, and is high in heat transfer efficiency; and energy saving and environment protection are achieved.

Description

Technical field [0001] The invention relates to a thermal hydrolysis method of sludge. Background technique [0002] The thermal hydrolysis of sludge refers to: heating the sludge in a closed container under certain temperature and pressure conditions, so that the sludge flocs are disintegrated, the cells are broken, the organic matter is released, and the macromolecules are hydrolyzed, and treated by thermal hydrolysis It can improve the sedimentation performance, dewatering performance and biodegradability of sludge, thereby effectively improving the efficiency and quality of subsequent anaerobic digestion. [0003] The existing thermal hydrolysis methods of sludge mainly include the following two: [0004] 1. First pass the sludge into the tank body, and then pass the steam into the tank body. At the same time, use a mixer to stir the sludge to mix the sludge with the steam. The steam heats the sludge and makes the tank body have a certain pressure. The mud undergoes thermal hyd...

AI Technical Summary

Problems solved by technology

In this method, since the inner diameter of the sludge conveying pipeline 3 is much smaller than the diameter of the tank body, an agitator cannot be installed inside the sludge conveying pipeline 3, so that the sludge is heated unevenly in the sludge conveying pipeline 3, and the sludge Sludge is prone to sluggishness in the sludge conveying pipeline 3, and the inner wall is prone to fouling, which further reduces the heat transfer efficiency

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