Study On Structural Composition Regulation And Desulfurization And Denitrification Performance Of Coal-based Activated Carbon

NO_X,SO₂and other air pollutants not only have great damage to the ecology and social economy,but also seriously endanger our human health.Therefore,it is urgent to take effective ways to control and reduce NO_Xand SO₂emissions into the air.Activated carbon flue gas purification technology has the advantages of relatively simple operation of process equipment,relatively low cost,and activated carbon renewable utilization,making it an effective scheme for purifying industrial flue gas.At the same time,the rapid promotion of activated carbon flue gas purification technology makes the flue gas purification carbon-based material products show a spurt of development,but due to the low performance of activated carbon desulfurization and denitration problems,restrict the further development of activated carbon method flue gas purification technology,so there is an urgent need to develop activated carbon products with higher desulfurization and denitration performance.In this paper,the effect of activated carbon pore structure on desulfurization performance was studied after optimization of process parameters,and the key factors affecting desulfurization performance were found out.And by introducing the addition of ore in the source of activated carbon preparation,study the impact of ore composite on denitration performance,in order to develop the key technology of high performance activated carbon material preparation,and finally achieve the improvement of the quality of activated carbon desulfurization and denitration,while boosting the further development of activated carbon method flue gas purification technology.The main conclusions of this paper are as follows:（1）After optimizing the process parameters and obtaining the optimal process of carbonization at 800℃and water activation at 900℃,the factors affecting the desulfurization performance of activated carbon were explored,and it was found that the pore structure had an obvious influence on the desulfurization performance.The results show that micropores in the pore structure of activated carbon have a greater influence on desulfurization performance,and the relationship between the specific surface area of micropores and the desulfurization performance is more close than that of micropore volume.The desulfurization value of activated carbon can be preliminatively determined by the specific surface area of micropores/total specific surface area,and the pore size distribution is mainly between 0.6 and1.3nm.（2）The influence of ore composition on the denitration performance of activated carbon was studied through characterization analysis and denitration performance testing of ore composite samples.The characterization results show that the activated carbon samples added with ore will introduce metal oxides corresponding to the ore composition,and will form more oxygen-containing acid groups on the surface of activated carbon.The results of denitration performance show that the denitration rate of samples containing Mn ore is better than that containing Fe ore,and the denitration performance of samples containing both Mn and Fe element is better than that of a single load.At the same time,the ore proportion of the best selected ore was optimized,and 6 wt%ore was selected as the optimal ore proportion sample according to the denitrification effect and ash index.The effect of ore compound on the denitrification performance of activated carbon was verified by XRD characterization and denitrification performance test.The results show that the phase composition of the loaded sample is consistent with that of the ore composite sample,and the denitrification performance is consistent with that of the ore composite sample,which verifies the feasibility of adding ore to improve the denitrification performance of activated carbon.