Feed System

Abstract

Transport system for the introduction of biomass into a gasifier comprising: a plug screw that forces the biomass into the gasifier, wherein the plug screw is formed such that the biomass is compressed in order on the one hand for it to be conveyed against a pressure in the gasifier and, on the other hand, to leave the gas and bed material in the gasifier, having a gate valve adjacent to the plug screw and which closes when the plug screw stops so that heat, vapour and gas cannot escape.

1 . Transport system for the introduction of biomass into a gasifier comprising:
 a plug screw that forces the biomass into the gasifier, wherein the plug screw is formed such that the biomass is compressed in order on the one hand for it to be conveyed against a pressure in the gasifier and, on the other hand, to leave the gas and bed material in the gasifier,   having a gate valve adjacent to the plug screw and which closes when the plug screw stops so that heat, vapour and gas cannot escape.   
   
   
       2 . The transport system according  claim 1 , wherein a cooling system cools the plug screw from the inside or the outside. 
   
   
       3 . The transport system according  claim 1 , wherein one gate valve is arranged upstream of the plug screw and one gate valve is arranged downstream of it. 
   
   
       4 . The transport system according  claim 1 , whereby a cellular wheel feeder is mounted before the plug screw onto which a feed chute abuts. 
   
   
       5 . The transport system according  claim 1 , whereby the plug screw is equipped in its forward area with a system of nozzles that operates in a similar fashion to a jet pulse system. 
   
   
       6 . The transport system according  claim 1 , whereby a sealing gas may be introduced into the casing of the plug screw, more particularly N2 (nitrogen) or CO2 (carbon dioxide) is supplied to the injection tube. 
   
   
       7 . The transport system according  claim 1 , whereby a buffer that operates with a regulated discharge unit, is connected upstream of the plug screw. 
   
   
       8 . The transport system according  claim 1 , whereby the discharge system comprises a screw mounted centrally in the buffer silo and regulated by a controller. 
   
   
       9 . The transport system according  claim 8 , whereby the entire screw can be moved over the floor of the bunker, also by means of a speed-regulated rotary drive. 
   
   
       10 . The transport system in accordance with  claim 1 , whereby one or more metering screw(s) meter the biomass that is fetched from the buffer bunker and, where necessary a transport screw transports the biomass to the plug screw. 
   
   
       11 . The transport system i according  claim 1 , whereby a control unit that calculates the volume of gas produced proportionally to the feedstock so that this physical dependence can be used as a control for the volume of material fed so that the measurement of the synthesis gas volume, or the comparison between the specified value and the measured volume of syngas produced may be used as the managing control for the volume of feedstock. 
   
   
       12 . Method for the introduction of biomass into a gasifier comprising:
 introducing of the biomass by way of a plug screw whereby the plug screw is regulated such that the biomass is compressed in order on the one hand for it to be conveyed against a pressure in the gasifier and, on the other hand, to leave the gas and bed material in the gasifier,   Closing of a gate valve adjacent to the plug screw and which closes if the plug screw stops so that heat, vapour and gas cannot escape.   
   
   
       13 . The method according  claim 12 , wherein a cooling system cools the plug screw from the inside or the outside. 
   
   
       14 . The method according  claim 12  whereby one gate valve is mounted upstream of the plug screw and one is mounted downstream of it and these are closed as a function of the supply or removal of the biomass. 
   
   
       15 . The method according to  claim 12  whereby a cellular wheel feeder is mounted upstream of the plug screw onto which a feed chute abuts wherein the feeder is controlled such that the plug screw is continuously supplied with biomass. 
   
   
       16 . The method according  claim 12  whereby the plug screw is equipped in its forward area with a system of nozzles that operates in a similar fashion to a jet pulse system to inject into the biomass. 
   
   
       17 . The method according  claim 12  whereby a sealing gas is introduced into the jacket of the plug screw, more particularly N2 (nitrogen) or CO2 (carbon dioxide) is supplied under pressure to an injection tube to prevent the occurrence of a drop in pressure. 
   
   
       18 . The method according  claim 12  whereby the plug screw is supplied from a buffer by a regulated discharge unit. 
   
   
       19 . The method according  claim 12 , whereby the discharge system comprises a screw mounted centrally in the buffer silo and regulated by a controller. 
   
   
       20 . The method according  claim 19 , whereby the entire screw is moved over the floor of the bunker, also by means of a speed-regulated rotary drive. 
   
   
       21 . The method system according  claim 12 , whereby one or more metering screw(s) meter the volume that is fetched from the buffer bunker and, where necessary a transport screw transports the biomass to the plug screw. 
   
   
       22 . The method according  claim 12  whereby a control unit calculates the volume of gas produced proportionally to the feedstock so that this physical dependence can be used as a control for the volume of material fed so that the measurement of the synthesis gas volume, or the comparison between the specified value and the measured volume of syngas produce may be used as the managing control for the volume of feedstock.