Method and device for conveying combustion residues

Abstract

The present invention relates to a method for conveying combustion residues ( 6 ) along a conveying path out of a combustion chamber ( 1 ) in a conveying device ( 2 ), comprising the following steps: a) conveying the combustion residues ( 6 ) out of the combustion chamber ( 1 ) by means of a conveying device ( 2 ) which has at least one housing ( 4 ); b) producing a first pressure level ( 12 ) in the housing ( 4 ); c) additionally treating the combustion residues ( 6 ) in a treatment device ( 5 ) arranged in the conveying path; d) producing a second pressure level ( 13 ) in the conveying direction ( 7 ) of the combustion residues ( 6 ) downstream of the treatment device ( 5 ) by introducing a fluid ( 14 ) in order to form a pressure gradient.

1 . Method for conveying combustion residues along a conveying path out of a combustion chamber in a conveying device, comprising:
 a) conveying the combustion residues out of the combustion chamber by means of a conveying device which has at least one housing;   b) producing a first pressure level in the housing;   c) additionally treating the combustion residues in a treatment device arranged in the conveying path;   d) producing a second pressure level in a conveying direction of the combustion residues downstream of the treatment device by introducing a fluid in order to form a pressure gradient.   
     
     
         2 . Method according to  claim 1 , wherein the second pressure level is set between 20 to 600 mbar lower than the first pressure level. 
     
     
         3 . Method according to  claim 1 , wherein the fluid is introduced at a velocity of at least 4 m/sec. 
     
     
         4 . Method according to  claim 1 , wherein the fluid is supplied at a pressure of 4 to 10 bar. 
     
     
         5 . Method according to  claim 1 , wherein at least the first pressure level, the second pressure level, a temperature or a fluid content in the housing is recorded. 
     
     
         6 . Method according to  claim 1 , wherein gaseous and smoky combustion residues are at least partially recycled into the combustion chamber. 
     
     
         7 . Method according to  claim 1 , wherein at least one region immediately upstream or downstream of the treatment device is monitored for the presence of the fluid and, if the fluid is present, at least the pressure gradient, the recycling or the supply of air is increased or the supply of the fluid is reduced as a function of at least one recorded measured value. 
     
     
         8 . Method according to  claim 1 , wherein downstream of the treatment device in the conveying direction, a fluid barrier is produced at least in the housing or at a housing outlet. 
     
     
         9 . Method according to  claim 1 , wherein an entry direction of the fluid entering the housing is selected in such a manner that said entry direction has at least one directional component in the conveying direction of the combustion residues. 
     
     
         10 . Apparatus for conveying combustion residues along a conveying path with a conveying device, which has at least one housing, and with a treatment device which is arranged in the conveying path and is intended for treating the combustion residues, wherein downstream of the treatment device, as seen in a conveying direction of the combustion residues, at least one nozzle means is provided for introducing a fluid into the housing, and the fluid is accelerated as the fluid flows through the nozzle means in order to produce a second pressure level in the conveying direction downstream of the treatment device. 
     
     
         11 . Apparatus according to  claim 10 , wherein conducting means for an at least partial recycling of gaseous and smoky combustion residues into the combustion chamber are provided on the housing downstream of the nozzle means in the conveying direction. 
     
     
         12 . Apparatus according to  claim 10 , wherein at least one measuring means, which is connected to a control device for controlling the supply of fluid, the supply of air or the recycling using control or regulating means, is arranged at least in the conveying direction upstream or downstream of the treatment device. 
     
     
         13 . Apparatus according to  claim 12 , wherein the control device is designed for determining a pressure gradient. 
     
     
         14 . Apparatus according to  claim 10 , wherein an air inlet is provided on the housing upstream of the treatment device in the conveying direction. 
     
     
         15 . Boiler, comprising:
 a combustion chamber; and   an apparatus to convey combustion residues from a first location adjacent to the combustion chamber to a second location remote from the combustion chamber, the apparatus including:
 a conveying device having a housing which defines a conveying path having a conveying path direction from the first location to the second location, the conveying device being constructed and arranged to convey the combustion residues out of the combustion chamber and along the conveying path, 
 a treatment device disposed along the conveying path, the treatment device being constructed and arranged to treat the combustion residues, and 
 a nozzle assembly downstream from the treatment device, the nozzle assembly being constructed and arranged to introduce a fluid into the housing, and accelerate the fluid to form a pressure gradient in which pressure drops along the conveying path direction from the first location to the second location. 
   
     
     
         16 . Method according to  claim 1 , wherein at least one region upstream of the nozzle means is monitored for the presence of the fluid and, if the fluid is present, at least the pressure gradient, the recycling or the supply of air is increased or the supply of the fluid is reduced as a function of at least one recorded measured value.