Characteristics of wet desulfurization sintering gas and its development and application of treatment technology
In order to ensure that SO2,NOx and dust in sintering gas meet the ultra-low emission standard,it is necessary to build or renovate the denitrification system on the basis of the original wet desulfurization system of iron and steel enterprises.In view of the problems in gas treatment engineering,wet desulfurization and sintering gas are taken as the research objects,the factors affecting the moisture content of flue gas are analyzed in view of the problems of high energy consumption,equipment corrosion and blockage of existing technical systems,and gas treatment technologies,such as slurry cooling of waste heat-driven desulfurization tower,dual-heating SCR denitrification,and differentiated modular flow field mixing,are developed.The results show that,after wet desulfurization,the sintering gas is saturated wet gas,with a moisture content of 10％～12％,a dew point temperature of 65～80 ℃,a large number of fog droplets and a high content of melt salts.Reducing the gas temperature can increase the SO2 partial pressure,which is conducive to improving the desulfurization efficiency.When the temperature drop range is 7～11 ℃,the operating cost of the system is the lowest,which is about 0.381 7 yuan/t(iron ore);The dual-heating SCR denitrification reaction system conditions the wet gas with water into a slightly superheated dry gas,so that the heating process is clogg-free and can achieve efficient on-line ash cleaning.The numerical simulation results show that the temperature deviation gradually decreases with the increase of the number of air mixing units.With the increase of the aspect ratio,the temperature deviation gradually decreases,and the influence of the number of slice on the mixing effect is weakened.The multi-point array mixing unit with 11 mixing units has a very good enhanced mixing effect.The complete set of wet desulfurization and sintering gas treatment technology developed in this paper reduces the three indexes of particulate matter,SO2 and NOx in the gas from 250,754 and 219 mg/m3 at the inlet of the desulfurization system to 1.4,8.2 and 35 mg/m3 at the chimney discharge port,all of which achieve ultra-low emissions.
sintering gasultra-low emissionwet desulfurizationdesulfurizerSCR denitrificationflow field mixing technology
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维普
