METHOD AND DEVICE FOR CONTINUOUS THERMAL HYDROLYSIS WITH RECOVERED STEAM RECIRCULATION

摘要

The invention relates to a continuous thermal hydrolysis method for sludge to be treated containing organic material, said method comprising the following steps: simultaneously injecting recovered steam into said sludge and mixing said sludge with said recovered steam using a primary dynamic injector/mixer so as to obtain a primary uniform mixture; simultaneously injecting fresh steam into said primary uniform mixture and mixing said primary uniform mixture with said fresh steam using a secondary dynamic injector/mixer so as to obtain a secondary uniform mixture; conveying said secondary uniform mixture to a pressurised tubular reactor and inducing the flow of said secondary uniform mixture in an essentially plug flow manner into said reactor with a sufficient residence time and at a sufficient temperature to allow the thermal hydrolysis of the organic material present in said secondary uniform mixture; producing said recovered steam inside means for producing recovered steam from said secondary uniform mixture obtained at the outlet of said tubular reactor; cooling said secondary uniform mixture when it leaves said means for producing recovered steam to a temperature allowing the subsequent digestion of the hydrolysed organic material contained therein. The invention also relates to a device.