China's steel industry is the second largest energy-intensive and highly polluting industry after the power industry. The sintering process consumes 10% to 20% of the total energy consumption of the steel industry. The sintering process also produces sulfur dioxide and nitrogen in the iron and steel industry The main source of oxides.
According to the statistics, the amount of waste heat generated from the production of 1t sinter is 1000 ~ 1300MJ / t, the produced flue gas can carry 0.45 ~ 0.75kg / t of nitrogen oxides and 0.85 ~ 2.55kg / t of sulfur oxides, so sintering Process has become a key area of ​​energy-saving emission reduction in China.
Based on the flue gas atmosphere and temperature distribution of a 430m2 sintering machine and a ring cooler for a steel plant, a scholar from Shanghai University of Science and Technology proposed a one-stop solution to the desulphurization-waste heat utilization-desulphurization of sintering flue gas. According to the atmosphere and temperature of the sintering flue gas, the sintering flue gas is divided into three parts: non-desulfurization and denitrification flue gas (115 ℃), desulfurization and denitrification flue gas (86 ℃) and desulfurization flue gas (360 ℃).
The process is as follows: firstly, the desulfurization and denitrification flue gas is heated by hot air (150 DEG C) in the temperature stage of the cooler and the desulfurized flue gas and other external heat sources so that the desulfurization and denitrification temperature reaches 270-320 DEG C and then enters the denitrification device, Using the low temperature NH3-SCR method for denitrification; secondly, passing the flue gas with the temperature of 270-320 deg.C denitrification into the waste heat boiler to produce steam, part of the generated steam is used for preheating the sinter ore material, and the rest is integrated into the steam pipe network; then The 160 ° C boiler tail flue gas and heat after the desulfurization flue gas into the concentration tower, and the desulfurization tower from the ammonium sulfate solution heat exchange, the flue gas cooling to the optimal desulfurization temperature of 70 ~ 80 ℃ into the desulfurization Tower, the wet ammonia desulfurization technology for desulfurization, while ammonium sulfate solution due to the evaporation of water and concentrated, the flue gas waste heat is further effectively used. The process can maximize the recovery of waste heat from the sintering system flue gas and the flue gas emissions are effectively controlled.
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