Effect Of Regeneration Process On Physical And Chemical Structure And Desulfurization Performance Of Activated Coke

Actived coke flue gas desulphurization technology with pollutant SO2 resource utilization, which has no water resource consumption, no second pollution, harmless recycling and other advantages, has attracted widespread attention. However, due to the activity of coke pore structure is irregular, complex and active sites desulfurization reaction components complex. so far, The adsorption and the reaction mechanism of actived coke desulfurization process is still no definite conclusion, which will undoubtedly hinder the further development and improvement of actived coke desulfurization technology. Physicochemical structure and regeneration process on desulfurization performance of activated coke caused a significant impact. Therefore, through the comparison of different regeneration methods, study the cyclic pore structure in the regeneration process and the variation of surface chemical properties and desulfurization performance, key factors affect the performance of active coke desulfurization.The fixed bed reactor system is used in this thesis to study the thermal regeneration, microwave regeneration and water washing regeneration of activated coke desulphurization performance impact. Using N2 adsorption analyzer and SEM respectively characterization of activated coke pore structure and surface morphology, using XPS, FTIR characterization of life coke surface functional groups. On the basis of the above analysis, the effects of different regeneration methods on the pore structure and surface chemical properties of activated coke were studied. The following conclusions:To commercial activated coke as the research object, the fixed bed reactor-heat regeneration system of activated coke desulphurization circulating heat regeneration characteristics. In SO2, O2, H2 O adsorption combined conditions, four times before the loop, the desulfurization performance by 67.48mg/g declined to 53.02mg/g. After 4~8 cycles, the desulfurization performance to maintain the basic 53.5mg/g about. Then, after 3 cycles, desulfurization performance rapidly declined to 38.76mg/g. when pore volume and pore ratio is 2-3, the performance of activated coke out better desulfurization performance. The functional groups of O-C=O and π-π could promote the desulfurization of activated coke, and the functional groups of C=O possible inhibitory effect on desulfurization.Under 100 W regenerative power, microwave regeneration can significantly improve the desulfurization properties of activated coke. Before the Sixth times cycle, actived coke desulfurization performance promote 67.2mg/g to 129.8mg/g. During 7~8 cycles and maintain basic actived coke desulfurization performance at about 94mg/g. Compared to thermal regeneration cycles after desulfurization performance decreased significantly and microwave regeneration even can significantly improve the performance of actived coke desulfurization, repeatedly cycling performance remained at a high level. Washing regeneration conditions, due to the incomplete regeneration, will cause the adsorbate on the micropore blockage, thereby affecting the circulation desulfurization properties of activated coke.Comprehensive comparison of conventional thermal regeneration, effect of microwave regeneration and the washing of regeneration of activated coke pore structure and surface functional groups, combined with their circulation desulfurization performance. The ratio between micropore volume and mesopore and maropore pore volume has a crucial role in desulfuring, the functional group of π-π could promote the desulfurization.