Process and device for injecting a finely divided material into a hot gaseous flow and apparatus for carrying out this process

Device for injecting at least one stream of a finely divided material into a hot gaseous flow, comprising:

• (a) a thick plate pierced with a plurality of traversing jets and capable of being transversely interposed on the path of said hot gaseous flow, in order to fractionate said hot gaseous flow into a plurality of elementary flows which are at least approximately parallel to each other;
• and
• (b) at least one channel made in the thickness of said plate and connecting a supply means arranged at a periphery of said plate to at least one jet supported by said plate and surrounded at least partially by said traversing jet, said supply means being adapted to be fed with finely divided material and the axis of said jet being at least approximately parallel to said elementary flows.

A process for injecting at least one stream of a finely divided material into a hot gaseous flow, said process comprising the steps of:

• (a) interposing on the path of said hot gaseous flow a screen pierced with a plurality of orifices spatially distributed about said hot gaseous flow so as to fractionate the latter into a plurality of elementary flows at least approximately in the same general direction;
• and
• (b) leading said stream of finely divided material to at least one nozzle at least partially surrounded by said orifices and injecting the finely divided material counter-flow with respect to said elementary hot gas flows, in order to create at least one stream of finely divided materal, whose direction of flow is counter to that of said elementary hot gaseous flows and surrounded by at least certain of them.