Fluidised bed reactor for converting NiCl2 to Nio 1

[ake71]

I am looking into the positioning of lances for the injection of NiCl2 into the FBR. Currently the lances are positioned near the top of the fluidised bed, but the intention is to lower them an additional 400mm down from the original position,with a reduction of inclanation of approx 8 degrees and therfore increase the "line sight to the floor" by about 50%. There are three lances to be lowered which are equally distanced from each other around the perimeter of the FBR. The theory behind it is that it will significantly improve the flexibility of production. Is this true?
Does anyone had/have experiences regarding injection lances for Nio production and if so can they advise if lowering the lances by 400mm is a good idea or whether this will increase additional problems. I have also being trying to google the info but with no luck.