Method For Operating A System For Producing Bioethanol

Abstract

The invention relates to a method for operating a system for producing bioethanol, wherein organic waste products of the production process, particularly DGS and DDGS, are combusted and the useful heat is fed back into the system itself. The combustion process takes place in a fluidized bed oven. All areas in which the combustion process takes place have sufficient heat removed that the melting point of the ash of the waste product, particularly 70° C., is not exceeded at any point. In this manner, a fine-grained ash forms and largely mixes into the fluidized bed and is easily disposed of. The useful heat is obtained partially from the flue gas arising from the combustion, and partially from the heat extracted from the combustion process for maintaining the maximum temperature.

1 . A method for operating a system for producing bioethanol, in which organic waste products from the production process, in particular DGS and DDGS, are combusted and useful heat obtained in this way is returned to the system itself, comprising the steps of:
 combusting the waste products in a fluidised bed combustor, and removing sufficient heat is removed from all chambers in which the combustion process takes place so that a melting point of an ash of the waste products is not exceeded at any location; and   obtaining useful heat partly from flue gases that arise during combustion and partly from the heat removed from the combustion process in order to ensure observance of the maximum temperature.   
     
     
         2 . The method of  claim 1 , wherein the useful heat is used at least partly to generate steam. 
     
     
         3 . The method of  claim 1 , wherein to remove the heat from the combustion process, at least one heat transfer means through which a heat transfer medium flows is used. 
     
     
         4 . The method of  claim 3 , wherein the heat transfer medium is water. 
     
     
         5 . The method of  claim 3 , wherein the heat transfer medium is a thermal oil. 
     
     
         6 . The method of  claim 1 , wherein the air used to generate a fluidised bed is pre-heated by the flue gases exiting the fluidised bed combustor. 
     
     
         7 . The method of  claim 1 , wherein waste products which would ignite if introduced above a fluidised bed are introduced directly into the fluidised bed. 
     
     
         8 . The method of  claim 1 , wherein waste products which would not ignite on being introduced above a fluidised bed and whereof the nature would cause them to rise in a gas flow above the fluidised bed are introduced directly into the fluidised bed. 
     
     
         9 . The method of  claim 1 , wherein waste products which do not ignite on being introduced above a fluidised bed and whereof the nature causes them to sink in a gas flow above the fluidised bed are introduced above the fluidised bed.