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Volume 16, No. 9, September 2016, Pages 2287-2293 PDF(788 KB)  
doi: 10.4209/aaqr.2016.03.0126   

Acid Mist Cyclone Separation Experiment on the Hydrochloric Acid Regeneration System of a Cold Rolling Steel Plant

Yan-Hong Zhang, An-Lin Liu, Liang Ma, Yi-Mou Wang

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China

 

Highlights
  • Flue gas purification of acid regeneration system.
  • Recycling of HCl drops and Fe2O3 dust at the same time.
  • High separation efficiency and low pressure drop.

Abstract

 

In the hydrochloric acid regeneration system of a cold rolling steel plant, the large amounts of hydrochloric acid droplets and iron oxide dust in the flue gas at the absorption column outlet cause serious air pollution. To reduce pollution, a high-precision cyclone separator is utilized to recycle hydrogen chloride acid mist and iron oxide dust simultaneously. The key factors of the high-precision cyclone separator, such as pressure drop, separation efficiency, and fluid density, are investigated to determine the optimal operation parameters under practical working conditions. Results show that the separation efficiency of the cyclone separator increases rapidly initially and then decreases gradually with an increase in pressure drop. Pressure drop and separation efficiency increase slightly with an increase in inlet fluid concentration. When the velocities of the inlet gas are 4.8–10 m s–1 and 5.0–9.2 m s–1, the separation efficiencies of hydrochloric acid and iron oxide are both higher than 80%. When the velocity of the inlet gas is 6.67 m s–1, the separation efficiencies of hydrochloric acid and iron oxide reach the highest values of 92% and 89%, respectively.

 

 

Keywords: Flue gas purification; Cold rolling steel plant; Hydrochloric acid regeneration; Cyclone separator; Separation performance.

 

 

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