Simulation of exhaust gas heat recovery from a spray dryer

Boris Golman, Wittaya Julklang

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

This study explored various alternatives in improving the energy utilization of spray drying process through the exhaust gas heat recovery. Extensible and user-friendly simulation code was written in Visual Basic for Applications within Microsoft Excel for this purpose. The effects of process parameters were analyzed on the energy efficiency and energy saving in the industrial-scale spray drying system with exhaust gas heat recovery in an air-to-air heat exchanger and in the system with partial recirculation of exhaust air. The spray dryer is equipped with an indirect heater for heating the drying air. The maximum gains of 16% in energy efficiency and 50% in energy saving were obtained for spray drying system equipped with heat exchanger for exhaust air heat recovery. In addition, 34% in energy efficiency and 61% in energy saving for system with recirculation of exhaust air in the present range of process parameters. The high energy efficiency was obtained during drying of large amount of dilute slurry. The energy saving was increased using the large amount of hot drying air.

Original languageEnglish
Pages (from-to)899-913
Number of pages15
JournalApplied Thermal Engineering
Volume73
Issue number1
DOIs
Publication statusPublished - Dec 5 2014

Keywords

  • Energy recovery
  • Excel
  • Exhaust gas
  • Simulation
  • Spray drying
  • Visual Basic for Applications

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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