期刊
ENERGY
卷 251, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2022.123950
关键词
Co -combustion; Biomass; Alkali metals; Ash characteristics; Coal gangue
资金
- National Natural Science Foundation of China [52164033]
- Science and Technology Project of Guizhou Province [[2022] yiban032]
The co-combustion of biomass and coal gangue can reduce SO2 emissions and decrease ash fouling/slagging tendency. Research findings suggest that at a CG blending ratio <40%, K mainly forms K2SO4 and KAlSi3O8, while at a CG blending ratio >40%, it mainly forms KAlSi3O8.
Co-combustion of biomass and coal gangue (CG) is a potential technique for using both resources. The alkali migration plays a key factor for reducing ash slagging and SO2 emission, but its mechanism unclear. Hence, the K migration in co-combustion of rice straw (RS) and CG was well studied in this work. The results indicated that the influence of CG addition on K migration is related to the CG blending ratio. For a CG blending ratio <40%, one hand the released SO2 reacted with KCl and KOH to form relatively stable K2SO4; On the other hand, KCl, KOH and K2SO4 interacted with mullite and quartz to form KAlSi3O8. For a CG blending ratio >40%, K mainly reacted with mullite and quartz to form KAlSi3O8. Therefore, cocombustion is expected to reduce SO2 emissions by up to 18.19% at a CG blending ratio of 30%. Furthermore, the ash fouling/slagging tendency decreased from 0.62 without CG to 0.26-0.47 with CG. Considering these reasons, we suggested a 20%-30% CG blending ratio as the optimum feedstock composition for the co-combustion of RS and CG, and the co-combustion could consume 0.17-0.23 kg/ (kW center dot h) of CG and reduce 0.45-0.43 kg-CO2/(kW center dot h).
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