ارائه یک مدل ریاضی برای تعیین اثر دما، قطر و رطوبت قطره بر روی عملکرد یک خشک‌کن پاششی صنعتی

نویسندگان

1 دانشگاه تهران

2 دانشگاه امام حسین(ع)

3 دانشگاه علم و صنعت ایران

کلیدواژه‌ها


عنوان مقاله [English]

A Mathematical Model for Determination of Effect of Temperature,, Diameter and Moisture Content of Droplet on Efficiency of an Industrial Spray Dryer

چکیده [English]

Spray dryers are one the most applicable dryer in chemical industries. In spite of different theoretical
researchs on spray drying, industrial dryer performance is still a considerable subject for scientists. In this
investigation, at first, a mathematical model of a spray dryer was persented and then, the model was applied
on an industrial case (Paxan Co.) with presentation of basic relations and equations. Thus, variation of feed
temperature, droplet diameter and humidity versus time and also, effects of feed temperature and nozzel
orifice diameter on droplet distance in vertical and horizental axes in the spray dryer tower were
investigated. The obtained results from mathematical model and practical data show that effect of droplet
humidity on outlet gas depends on contact time between droplet and gas. In contact time more than five
seconds, higher temperature of feed causes more decrease of outlet gas temperature. In enough contact time,
diameter of droplets with high temperature can be less than droplet with low temperature. Also, the nozzle
with 3.5mm diameter produces low diameter droplet and decreases vaporization load of tower. According to
the results, nozzle feed temperature doesn`t affect on gas temperature at the beginning of gas entry. The
comparison between model results and pactical data shows that this model satifies the data very well.

کلیدواژه‌ها [English]

  • Spray dryer
  • mathematical model
  • feed Temperature
  • Orifice
  • Droplet