Temperature change of the wall layers of wheat grain during its storage in silos of elevators
Authors:   Research Institute for Storage Problems of the Federal State Reserve Agency, Loose V.V. , Gurieva K.B. ,   Research Institute for Storage Problems of the Federal State Reserve Agency, Beletsky S. L. ,   VNIIKP – branch of the Federal Scientific Center for Food Systems named after V. M. Gorbatova, Kostromina T.G. ,   Research Institute for Storage Problems of the Federal State Reserve Agency
Published: April 2022

Conducting  research  to  clarify  the  mechanism  of  temperature  migration  inside  reinforced  concrete  silos  is  relevant,  since  there  is  little  data  in  the  literature  on  the  study  of  the  dynamics  of  changes  in  internal  temperatures  in  reinforced  concrete  silos,  more over,  they  were  obtained  quite  a  long  time  ago.  The  purpose  of  experimental  research  is  to  study  the  dynamics  of  grain  temperature  change  in  the  center  of  the  silo  in  the  traditional  way  using  thermal  suspensions,  as  well  as  a long  horizontal  layers,  to  determine  the  thickness  of  the  near wall  grain  layer  subject  to  the  greatest  heating / cooling,  as  well  as  to  highlight  the  critical  layer  in  it.  The  article  presents  an  analysis  of  the  results  of  monitoring  the  temperature  regime  of  wheat  storage  using  a  measuring  system  of  thermohygrometers  (loggers)  of  the  DS1923-F5  type.  The  studies  were  carried  out  during  the  annual  cycle  in  the  outer  silos  of  an  elevator  located  in  the  temperate  climate  of  the West  Siberian  climatic  region.  The  distribution  of  temperatures  along  the  vertical  of  silos  at  three  levels  (upper,  middle  and  lower),  the  distribution  of  temperatures  along  the  horizontal  of  silos  (at  different  distances  from  the  wall  of  the  silo  from  5  to  75  cm)  was  studied.  A  comparative  analysis  of  the  data  on  the  temperature  regime  in  silos  located  on  the  southern  and  northern  sides  of  the  elevator  was  made.  New  original  data  from  thermohygrometers  were  obtained,  which  were  statistically  processed.  The  thickness  of  the  near wall  layer  of  the  grain  mass,  which  is  most  susceptible  to  undesirable  temperature  effects  for  the  outer  silos  of  the  southern  and  northern  sides  of  the  elevator,  has  been  determined.  near-wall  layers  of  grain  and  spaced  from  the  outer  wall  up  to  one  meter.  It  is  shown  that  the  most  critical  with  a  higher  temperature  is  the  upper  level,  where  it  is  necessary  to  more  carefully  control  the  quality  of  the  grain.  The  middle  and  lower  levels  are  in  more  favorable  temperature  conditions  of  preservation.  The  most  critical  horizontal  layers  of  grain  (i. e.,  having  a  temperature  above  15 ° C  in  summer)  at  the  lower  level  are  the  layers  from  the  near-wall  to  the  silo  separated  from  the  walls  by  35  cm,  and  at  the  upper  level  all  layers  from  the  near-wall  to  the  silo  separated  from  the  walls  at  75  cm.