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

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 highprecision 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.

Separation Characteristics in a Novel Gas–Liquid Vortex Separator

“…The Eu number of GLVS-1 is 15.99. The Eu number of Zhang’s cyclone is about 13.8 . Austrheim tested pressure characteristics in some different vortex strictures, and their Eu numbers range from 8.0 to 9.5 .…”

“…The Eu number of Zhang's cyclone is about 13.8. 27 Austrheim tested pressure characteristics in some different vortex strictures, and their Eu numbers range from 8.0 to 9.5. The Eu number of Ma's cyclone is around 14.1.…”

“…Considering maximum handling capacity, the optimum operating gas velocity of the GLVS-2 maybe around 14.69 m/s. Zhang et al 27 discovered the optimal gas inlet velocity is 6.67 m/s in a cyclone of a cold rolling steel plant. Ma et al 29 found the optimal gas inlet velocity is 8.4 m/s in the cyclone a hydrogen unit.…”

Synthesis of Lanthanum Oxide Using Hydrogen Peroxide as Auxiliary Reagent by Spray Pyrolysis Method

“…This technology has been widely used in the recycling of acid liquid of iron and steel industry [3][4][5][6][7]. The Wuhan Iron and Steel [8], HanGang [9], Baoshan iron and steel plant, Panzhihua Iron and Steel, Anshan Iron and Steel and Baotou Iron and Steel all use this technology. The science and technology personnel of Japan, Germany, Austria Greece, China and other country from the aspects of baking furnace structure and the process parameters were studied to improve the quality of iron oxide, and they made some achievements in the control of the purity and granularity of the products [10][11][12][13][14][15][16][17].…”