will b fac d with signifiecant and troubl som
cond nsation.
V ry dry wood cr at s a diff r nt probl m. With
dry wood, pyrolysis t mp ratur s ar achi v d mor
quickly and th rat of gasifiecation is acc l rat d.
Theis may r sult in th consumption of availabl
oxyg n fast r than it can nt r th boil r. The fier
could th n b gin to r l as smok du to a
ph nom na known as “back pufficng”; “Back-puff ng”
r sults in smok b ing push d out through th
intak in int rmitta nt, and ofte n audibl , puff s. Low
moistur fu l (< 10% moistur ) r quir s sp cial
consid rations for a satisfactory burn. Dry sawdust
and shavings ar l ss of a probl m than kiln-dri d
solid blocks or logs.
With m dium moistur wood, 19-29%, th
combustion proc ss is mor constant, with pyrolysis
and th combustion of gas s and charcoal occurring
clos to a constant rat . Theis moistur cont nt of 19-
28% is optimum for burning wood in th gasifiecation
proc ss.
B caus of th downdrafte d sign of th Wood
Gun™, th rat of air admitta d to th unit is fairly
constant r gardl ss of th typ and amount of fu l
b ing burn d.
Most pyrolysis occurs b tw n 540º F (280º C)
and about 900º F (500º C). The most abundant gas s
produc d ar carbon monoxid , m than , m thanol,
formald hyd , and hydrog n as w ll as formic and
ac tic acids, wat r vapor and carbon dioxid . All of
th s l m nts must pass through th r fractory
combustion chamb r wh r , in th pr s nc of high
t mp ratur s and oxyg n, th y ar r duc d to
carbon dioxid and wat r. By th tim th
t mp ratur of th fu l r ach s 900º F (500º C)
pyrolysis is compl t and th fienal solid product is
charcoal, which is almost pur carbon.
MODE OF OPERATION
The Wood Gun™ op rat s on th w ll known
principl of gasifiecation which mak s it possibl to
burn wood at high fficci ncy and fr of cr osot
formation in th chimn y. The bottaom of th fu l
chamb r is lin d with pi c s of d ns r fractory
casting, which contain th primary combustion zon .
Theis combustion zon is link d to th fu l chamb r
by a s ri s of op nings (c nt r brick). The gas s
produc d from pyrolysis of th fu l charg ar
drawn through th op nings into th r fractory
combustion chamb r wh r a v ry int ns flaam
xc ding 1800º F (1000º C) is produc d. H at
g n rat d in th combustion chamb r radiat s
throughout th r fractory mass h ating th fu l
charg abov . As th fu l charg is subj ct d to h at,
th moistur is driv n from th wood and it b gins
to char, r l asing a vari ty of combustibl gas s.
The gas s produc d during pyrolysis would not
normally follow a downward path, so a drafte-
inducing fan is mploy d to cr at a partial vacuum
that draws th flaam through multipl tunn ls in th
r fractory. The s r fractory tunn ls mak up th
primary combustion ar a in th Wood Gun
TM
. Theis
long flaam path provid s sufficci nt r t ntion tim for
th gas s to caus n ar compl t combustion to
occur b for th hot gas s com in contact with th
wat r-back d h at xchang r surfac .
The mass of r fractory that ncompass s th
combustion chamb r also s rv s a s cond important
- 3 -
Wood with moisture content higher than 28% is
more likely to produce condensation issues and
will produce markedly less BTU’s per pound of
fuel.
You may not burn Unseasoned Wood!
Содержание WOOD GUN Super E210
Страница 2: ......
Страница 57: ...Appendix B Wiring Diagrams 51 ...
Страница 58: ...Appendix C Exploded Parts Drawings 52 ...
Страница 59: ... 53 ...
Страница 60: ... 54 ...
Страница 66: ...Appendix F Boiler Piping and Ducting Examples 60 ...
Страница 67: ...Wood Gun Air Inlet Ducting Installations 61 ...
Страница 70: ...APPENDIX G Markings 64 ...
Страница 71: ...Datalabel 65 ...
