Process and apparatus for depositing fluid in a solids flow of a fluidized bed apparatus

Abstract

The invention relates to a process for introducing fluids into a solids flow of a spouted bed apparatus, as well as an associated apparatus. For the present invention, it is characteristic that at least one circular solids flow is formed in the axial direction of the reaction space of the spouted bed apparatus, for which the inlet air required for forming the solids flow is fed through a gap in the lower region and in the axial direction of the reaction space and the fluid is introduced by means of one or more single or multiple-component nozzles at one or more positions into the solids flow. Therefore, the flow conditions in the injection region can be set, so that the fluid can be introduced selectively and adjustably into the solids flow. The resulting end product distinguishes itself through approximately equal grain size with equal material properties. Through the spraying of pure fluids, solutions, molten masses, or the like through one or more single or multiple-component nozzles into the solids flow, different end products can be produced.

1 . Process for introducing fluids into a solids flow of a spouted bed apparatus, for which the fluid is introduced through a nozzle into the spouted bed, wherein: 
 in a reaction space ( 26 ) of a spouted bed apparatus provided with a rectangular cross section, at least one circular solids flow ( 15 ) in the axial direction of the reaction space ( 26 ) is generated,    a fluid is injected into the solids flow ( 15 ),    the solids flow ( 15 ) is formed with an upwards flow ( 22 ) with a high flow rate, with a cross flow ( 23 ) with a lower flow rate, and with a downwards flow ( 24 ), which has a lower flow rate than the cross flow ( 23 ), by the supply of inlet air ( 10 ) through a gap ( 1 ) in the lower region and in the axial direction of the reaction space and by the injected fluid.    
     
     
         2 . Process according to  claim 1 , wherein the fluid is introduced by means of single and/or multiple-component nozzles ( 6 ,  7 ,  17 ) at one or more positions into the solids flow ( 15 ).  
     
     
         3 . Process according to  claim 1  and  2 , wherein an amount and a flow rate of the inlet air ( 10 ) supplied to the reaction space ( 26 ) and/or the air flow ( 12 ) can be set controllably.  
     
     
         4 . Process according to one or more of the preceding claims, wherein the downwards solids flow ( 24 ) is generated in the reaction space ( 26 ) through the effect of gravity.  
     
     
         5 . Process according to one or more of the preceding claims, wherein for several reaction spaces ( 26 ) the material is transported to the appropriate reaction spaces ( 26 ) through corresponding material overflow ports.  
     
     
         6 . Process according to one or more of the preceding claims, wherein the material dust ( 21 ) separated in a dedusting system ( 19 ) is fed back to the solids flow ( 15 ).  
     
     
         7 . Process according to one or more of the preceding claims, wherein a material supply is performed over a material inlet ( 13 ) into the reaction space ( 26 ) in the region of the downwards solids flow ( 24 ).  
     
     
         8 . Process according to one or more of the preceding claims, wherein the final product is discharged from the reaction space ( 26 ) or material is transported into another downstream reaction space ( 26 ) in the region of the transition of the cross flow ( 23 ) to the downwards solids flow ( 24 ).  
     
     
         9 . Process according to one or more of the preceding claims, wherein two opposing circular solids flows ( 15 ) are generated in the reaction space ( 26 ).  
     
     
         10 . Process according to one or more of the preceding claims, wherein pure fluids, solutions, molten masses, or the like are sprayed into the solids flow ( 15 ).  
     
     
         11 . Apparatus for introducing fluids into a solids flow of a spouted bed apparatus, in which a spray nozzle opens into a reaction space of the spouted bed apparatus, wherein a lower region of the reaction space ( 26 ) is provided with a rectangular cross section for the spouted bed apparatus and is limited in an axial direction by at least one inclined stream return flow wall ( 2 ) and an oppositely inclined stream inlet wall ( 3 ) with the formation of an axial gap ( 1 ) through the reaction space ( 26 ) for supplying inlet air ( 10 ) and at least one nozzle ( 6 ), ( 7 ), ( 17 ) for introducing fluid above the gap ( 1 ) opens into the reaction space ( 26 ).  
     
     
         12 . Apparatus according to  claim 11 , wherein the lower region of the reaction space ( 26 ) is limited in the axial direction by two inclined stream return flow walls ( 2 ), which are each associated with an inclined stream inlet wall ( 3 ) with the formation of two axial gaps ( 1 ), wherein the return flow walls are connected together in an upper region.  
     
     
         13 . Apparatus according to  claim 11  and  12 , wherein controllable valve devices for setting the amount and the rate of the air flow ( 12 ) supplied to the reaction space ( 26 ) are arranged in the gap ( 1 ).  
     
     
         14 . Apparatus according to one or more of the preceding claims, wherein the gap ( 1 ) is formed such that the air flow ( 12 ) of the inlet air ( 10 ) is guided against the lower region of the stream inlet wall ( 3 ).  
     
     
         15 . Apparatus according to one or more of the preceding claims, wherein one or more nozzles ( 6 ,  7 ,  17 ) for introducing fluid into the solids flow ( 15 ) at various positions above the gap ( 1 ) open into the reaction space ( 26 ).  
     
     
         16 . Apparatus according to one or more of the preceding claims, wherein the spouted bed apparatus is formed from one or more adjacent reaction spaces ( 26 ).  
     
     
         17 . Apparatus according to one or more of the preceding claims, wherein two adjacent reaction spaces ( 26 ) are connected to each other over a common overflow port, which is formed for the first reaction space as a solids outlet ( 5 ) and for the second reaction space as a solids inlet ( 13 ).  
     
     
         18 . Apparatus according to one or more of the preceding claims, wherein there is an axial separating plate ( 16 ), whose lower edge is arranged at a distance to the stream return flow wall ( 2 ) in the lower region of the reaction space ( 26 ) between the stream return flow wall ( 2 ) and the housing wall ( 3 ).  
     
     
         19 . Apparatus according to one or more of the preceding claims, wherein the upper region of the reaction space ( 26 ) is formed as a separating space ( 19 ).  
     
     
         20 . Apparatus according to one or more of the preceding claims, wherein a materiel inlet ( 15 ) opens into the reaction space ( 26 ) in the region of a downwards solids flow ( 24 ).  
     
     
         21 . Apparatus according to one or more of the preceding claims, wherein a solids outlet ( 5 ) is arranged in the region of the transition of the cross flow ( 23 ) to the downwards solids flow ( 24 ).  
     
     
         22 . Apparatus according to one or more of the preceding claims, wherein in the axial direction several adjacent nozzles ( 6 ) and/or ( 7 ) and/or ( 17 ) open into the reaction space ( 26 ) of the spouted bed apparatus.  
     
     
         23 . Apparatus according to one or more of the preceding claims, wherein the nozzles ( 7 ) act in the direction of an upwards flow ( 22 ), the nozzles ( 6 ) act against the direction of an upwards flow ( 22 ), and the nozzles ( 17 ) are arranged in the region of the downwards flow ( 24 ).