Energy valuation method of products obtained when purifying stillage from bio alcohol production and apparatus for making the same

摘要

The present invention relates to a method of energy recovery of a stillage cleaning product from a bioethanol production, the principle of which is to dry the solid waste from the stillage decantation centrifuge together with the following sludges, in particular protein sludges from the centrifuges to dewater the protein sludge after the prior separation of the protein sludge by sedimentation and thickening of the liquid stream from the decantation centrifuges of the stillage in the sedimentation tank with agitation of the alkaline layer, while the pH in the sedimentation of the separaciprotein sludge is maintained by the alkali dosing of 5.8 to 13; resulting in the production of a mixture of chemical sludge from precipitation of nitrogenous compounds in the form of magnesium ammonium phosphate, anaerobic and aerobic excess sludge, and also chemical sludge from the precipitation of excess phosphorus. and iron (III) phosphate, which, after centrifugation on decanting centrifuges, is also desiccated without dosing auxiliary polyfluids together with the previous dewatered sludge and protein to 40% to 90% dry matter, which allows the mixture to be incinerated without the production of granular pellets on boilers with a special blend mode shifting the mixture and temperature regime of the boiler to produce medium or high pressure steam, which then serves either in the case of high pressure steam or electricity generation, creating medium pressure steam, which then satisfies the energy requirements of the distillery, or directly produced medium pressure steam also satisfies the energy requirements of the distillery they can also be saturated by producing steam from the anaerobic product