Mr.  C.  G.  Atwater  In  connection  with  the  use  of  producer  gas,
Mr.  Junge  brings  out  briefly  a  point  in  producer  gas  firing  that  has
not,  perhaps,  received  all  the  attention  it  deserves.  Where  such  gas
is  made  in  large  quantities  and  transmitted  any  distance,  it  is  essen-
tial that  it  should  be  sufficiently  cooled  to  remove  the  moisture.
The  writer  recalls  distinctly  a  large  installation  of  producers  designed
to  provide  producer  gas  for  furnaces  of  peculiar  construction,  in
which  entirely  inadequate  provisions  were  made  for  cooling  the
gas.  The  consequence  was  that  the  gas  arrived  at  the  furnaces  at
about  80  degrees  fahr.  and  contained  so  much  water  and  tar  that  the
heats  produced  were  very  unsatisfactory.  At  another  plant,  oppor-
tunity was  given  to  observe  closely  the  results  of  cooling  producer
gas.  The  cooling  in  this  case  was  done  with  a  coke  scrubber  having
several  trays  over  which  cooling  water  was  sprinkled.  On  warm
summer  days,  when  it  was  difficult  to  get  the  temperature  below
80  degrees  fahr.,  the  heat  fell  oflf.  On  colder  days,  when  the  cooling
was  more  efficient,  say  down  to  60  degrees  fahr.,  the  heats  were  main-
tained with  ease.  As  the  curve  of  saturation  with  water  vapor
changes  direction  rapidly  about  these  temperatures,  a  relatively
small  reduction  in  temperature  eUminates  considerable  water,  and
thus  adds  to  the  efficiency  of  the  gas.
