Calculation of maximum sound pressure of steam emission from a C h P boiler unit

The  paper  considers  the  problem  of  the  noise  impact  of  the  CHP  operation  on  adjacent   settlements and on humans. At power generating facilities, the process of steam discharge from boilers is a powerful source of noise. This process occurs in emergency situations in order to reduce pressure and  during kindling. When discharged from boilers through the GPC, an under expanded and non-isothermal steam flow with high speed, pressure and temperature emits a noise equivalent in characteristics to the  sound  of  a  jet  engine.  To  perform  the  calculations,  a  request  was  made  for  data  on  steam  parameters in  front  of  the  GPC  from  the  Vyborgskaya  CHP  –  17  station,  part  of  the  TGC-1  power  generating  company  in  St.  Petersburg.  The  calculation  of  the  maximum  value  of  the  sound  pressure  of  steam  discharge from boilers was carried out. Sound pressure levels have been determined at various octave levels with average geometric frequencies in the range from 31.5 to 8000 Hz. A graph of the dependence of the sound pressure level on the octave level is constructed. It was revealed that the noise of steam discharge  has  a  high-frequency  character,  the  extreme  value  occurs  at  a  frequency  of  1000  Hz  and  is  equal  to  161.3  dB  for  boilers  No.  4,  5,  6  and  158.7  dB  for  boilers  No.  1,  2,  3.  For  comparison,  the  sound  pressure  level  of  the  noise  of  an  aircraft  jet  engine  is  approximately  160  db.  To  reduce  the  harmful effects of noise on humans and adjacent populated areas near the station, it is recommended to install  special extinguishing agents – silencers.

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