Process for using a facility for combusting carbonaceous materials and relating facility

Abstract

The invention concerns a process for using a facility in which circulates at least one oxide which is reduced and then oxidized in each of both reactors ( 1, 4 ) and including a reactor ( 1 ) for reducing oxide in which enter a grounded solid fuel material (E 1 ) and oxide (E 2 ), a lower efficiency separation device ( 2 ) receiving entrained solids from the reactor ( 1 ) for reducing oxide the upper stream of the solids of the lower efficiency separation device ( 2 ) being circulated into a higher efficiency separation device ( 6 ), in order to separate the solids from the gases and to re-introduce the solids into the reactor ( 1 ) for reducing oxides, a carbon separator ( 3 ) installed at the outlet of the lower efficiency separation device ( 2 ) in order to send the carbonaceous particles into the reactor ( 1 ) for reducing oxide and the oxide into a reactor ( 4 ) for oxidizing oxide and a separation device ( 5 ) receiving entrained solids from the reactor ( 4 ) for oxidizing oxide. According to the invention, the average particle diameter of the entering solid fuel material (E 1 ) is controlled to be at least twice smaller than the average particle diameter of the entering oxide (E 2 ).

1 . Process for using a facility in which circulates at least one oxide which is reduced and then oxidized in each of first and second reactors said method comprising the steps of:
 reducing oxide in a reactor in which enter a grounded solid fuel material and oxide,   receiving entrained solids from the first reactor in a lower efficiency separation device for reducing oxide,   circulating into a higher efficiency separation device the upper stream of the solids of the lower efficiency separation device in order to separate the solids from the gases and to re-introduce the solids into the first reactor for reducing oxide,   sending the carbonaceous particles into the first reactor via a carbon separator ( 3 ) installed at the outlet of the lower efficiency separation device for reducing oxide and the oxide into a second reactor for oxidizing oxide; and   receiving entrained solids at a separation device from the first reactor for oxidizing oxide, wherein in said process the average particle diameter of the entering solid fuel material is controlled to be at least twice smaller than the average particle diameter of the entering oxide.   
     
     
         2 . Process according to  claim 1 , wherein the solid fuel material is coal. 
     
     
         3 . Process according to  claim 1  wherein the oxide is metal oxide. 
     
     
         4 . Process according to  claims 1  wherein the average particle diameter of the entering solid fuel material is equal to about 50 μm. 
     
     
         5 . Facility for implementing the process according to  claims 1 , said facility comprising:
 a first reactor for reducing oxide in which enter a grounded solid fuel material and oxide,   a lower efficiency separation device receiving entrained solids from the first reactor for reducing oxide, the upper stream of the solids of the lower efficiency separation device being circulated into a higher efficiency separation device, in order to separate the solids from the gases and to re-introduce the solids into the first reactor for reducing oxide,   a carbon separator installed at the outlet of the lower efficiency separation device in order to send the carbonaceous particles into the reactor for reducing oxide and the oxide into a second reactor for oxidizing oxide and a second separation device receiving entrained solids from this reactor for oxidizing oxide.   
     
     
         6 . Facility according to  claim 5 , wherein the lower efficiency separation device has such efficiency that the average particle diameter of the finest particles fraction escaping from the lower efficiency separation device is about equal to said average particle diameter of the entering solid fuel material. 
     
     
         7 . Facility according to  claim 5  wherein the higher efficiency separation device is a separation cyclone. 
     
     
         8 . Facility according to  claims 5  wherein the lower efficiency separation device is a separation cyclone. 
     
     
         9 . Facility according to  claims 5  further comprising a solid cooling device implemented in between the lower efficiency separation device and the higher efficiency separation device.