1 reply to this topic

[tjsegan]

We have set up a moderately sized pyrolysis pilot in East Africa using some off the shelf technology. The reactor consumes about 250 kg/h of dried sugarcane bagasse and pyrolysis gases are combusted in a "chimney" box above the main reaction zone.

We have a short run of duct exposed to high temperatures coming off the reactor, as we draw the fully combusted flue gases at 650C to be used for direct heating of wet biomass in a rotary dryer. We're looking to replace and improve on the current duct design but are struggling to find good references on standard best practice or heuristics for hot combustion gas handling; we don't want to reinvent what must have surely been solved. Thus far, we've been unable to find unambiguous best practice for this type of service.

However, we are are considering using ceramic fiber blanket to insulate the internals of the ducts. I am hoping the forum can sense check this approach, or if there is a practical alternative that industry uses (our next best option is just to go straight to a stainless steel, but this will also creep over time). 

I appreciate any advice or direction that can be given and we'd be happy to share more information.

[breizh]

Hi,

You may want to consider an economizer on your chimney. Take a look at the PP attached

Breizh

Attached Files

•  cain_boiler_economizer.ppt   7.5MB   0 downloads