VRI reactor is mainly used in electrolytic aluminium flue gas purification system, its role is to alumina (AL2O3) uniform injection flue gas reaction to the device, and electrolytic aluminum hydrogen fluoride (HF) gas in flue gas chemical reaction and fluoride absorption, hydrogen fluoride gas into a solid form, again through the dust collector to collect down it. So as to achieve the aluminium of harmful gas in flue gas energy recovery governance purposes