[Gasification] Final control set for gasifier automation

[Greg Manning]

 Greetings List(s).


 I've been busy of late, finalizing an automation control set for a woodchip
downdraft gasifying boiler (hot water only), (true downdraft).

 I have now finalized these, and will be finishing the first p.c. (printed
circuit) board set (4 pcs.)  as a prototype, with printed & etched versions
shortly.



   I'm asking again if anyone has some input on the design that they think I
might have overlooked OR have done, in an unusual (or non-standard industry)
fashion, as this is NOT my true area of expertise.


 The Following is a brief description of areas of monitor, and control.


 Main Feedstock Bunker: (this has an autofeed to the "stoker hopper")

  2 areas of monitor, 1 sets an alarm state.

    Low Bunker (roughly 24 hours of feedstock left) (full bunker is 170+
hours @ 150,000 btu/hr)

    Bunker Empty (sets alarm, and shuts unit down.)



 Stoker Hopper:

  3 areas of monitor,  (full, feed, problem), 1 sets alarm state

    Full (stops autofeed from bunker)

    Feed (starts autofeed from bunker)

    Problem (feed problem, sets alarm, shuts unit down)



 Water Controls:

  3 areas of monitor, (2 set alarm state)

   Hi/low cycle (demand for heat)

   Overheat (sets alarm, shuts unit down)

   Low water (sets alarm, Shuts unit down)


 Keep alive:

  periodic "keep alive timer" with demand reset


   This unit simply counts to "N" if a demand event has not happened within
this count, this unit will low fire the gasifier for a short period, to
simply keep the char bed active. ( Example a warm spring day, where the
boiler has only fired once or twice in a twelve hour period, this timer
would for example, fire once every hour for three minutes, to keep the char
bed active).



 Any comments/input welcome (good or bad)

 Greg Manning






No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.19.12/1245 - Release Date: 1/26/2008
3:45 PM