TY - JOUR
TI - Estimation of condensate mass flow rate during purging time in heat recovery steam generator of combined cycle power plant
AU - Ehyaei Mehdi Ali
JN - Thermal Science
PY - 2014
VL - 18
IS - 4
SP - 1389
EP - 1397
PT - Article
AB - In this paper the transient modeling of HRSG (Heat recovery steam generator)  in purging time was considered. In purging time, compressed air from the gas  turbine was used to purge a combustible gas from HRSG. During this time;  steam condensate was formed in the superheater stage which should be drained  completely to avoid some problems such as deformation of superheaters.  Because of this reason, estimation of drain formation is essential to avoid  this problem. In this paper an energy model was provided and this model was  solved by MATLsoftware. Average model error is about 5%. Results show  that, during purge time, steam temperature was decreased from 502 (°C)  (Superheater 2), 392 (°C) (Superheater1) and 266 (°C) (Evaporators 1&2) to  130 (°C), 130 (°C) and 220 (°C), respectively and also steam pressure was  decreased from 52 (bar) to 23(bar) during purge time. At end of purge time,  condensate formation was about 220 (l) when inlet gas temperature was equal  to 100 (°C) and purge gas mass flow rate was equal to 386.86 (kg/s).