[Gasification] Flash torrefaction ?

[Philippe Raufast]

Hello,
can someone tell  me if  flash torrefaction can be achieved, or is it only a slow process ?
The usual method is heating biomass at 280 degrees Celcius for 20-30 minute .
Will heating   the biomass at a higher temp during a shorter time will do the job  ?
Maybe feeding finely chopped straw  in a low temp cyclone gasifier ?
Or with the rotating cone gasifier from the Twente university ?
Of  course with finer particulates the heat will reach  the inside more rapidly.
 Regards, Philippe.

http://www.ecn.nl/docs/library/report/2005/c05067.pdf
I've found this in the above pdf :

"By using this approach, it is also possible to define the heating rate of the biomass that is really 
relevant to the process. On average this is (Ttor-200 °C)/ttor,h, which will normally not exceed 50 
°C/min. Hence the particle heating rate is considered to be a less relevant parameter in 
torrefaction, as the torrefaction reactions are relatively slow. Note that Figure 2.4 is quite 
illustrative in what kind of error could be faced when the reactor residence time is mistaken with 
the reaction time of torrefaction."