Dry calcium based fixed bed hot blast stove flue gas treatment system

Currently, the majority of hot blast stove flue gas in domestic steel plants can achieve standard emissions of particulate matter and NO_x, while SO₂ is between 50～150 mg/Nm³, making it difficult to achieve ultra-low emissions. At the same time, the hot blast stove has three operating temperature conditions, namely 80% condition One flue gas temperature of 140～200 ℃, 10% condition 2 flue gas temperature of 200～260 ℃, and 10% condition 3 flue gas temperature of 300～310 ℃, with a maximum of 350 ℃. However, traditional wet desulfurization, semi dry desulfurization, and other desulfurization processes cannot meet the requirements of high-temperature conditions, and the high-temperature flue gas after pollutant treatment also has heat utilization requirements for subsequent sections. Based on the above situation and working conditions, a dry calcium based fixed bed hot blast stove flue gas treatment system has been independently developed to meet customer needs. Through valve feedback control, the flue gas from the hot blast stove is introduced into the desulfurization and denitrification tower. The chemical reaction and adsorption of pollutants such as SO₂ and NO_x in the flue gas by desulfurization and denitrification materials are utilized to remove some or all of the pollutants. Only the flue gas with a small temperature drop is sent to the milling process for waste heat utilization or discharged from the chimney. After saturation, the desulfurization and denitrification agent is unloaded onto the truck through the bottom discharge device, transported by truck to the raw material yard, crushed, and evenly mixed into the sintered ore material for sintering reuse. The desulfurization and denitrification materials and towers are the core of the entire system, which has simple process system, flexible layout, stable operation, low investment and operating costs.