摘要
提出了求解燃煤PM10磁种聚并动力学方程的二组元分区算法,采用该算法模拟了均匀磁场中Fe3O4磁种对0.023-9.314μm粒径范围内东胜煤灰和大同煤灰的聚并动力学过程,并与实验结果进行了比较.结果表明:计算值与实验值基本吻合;中间粒径的飞灰粒子脱除效率高于小粒子和大粒子的脱除效率;随磁感应强度、粒子质量浓度、粒子在磁场中停留时间的增加,总脱除效率提高,数目中位直径减小,两种煤灰的总脱除效率的差异增大;在粒子达到饱和磁化后,磁感应强度的增大对聚并无影响;随磁种添加质量比的增大,飞灰总脱除效率提高,数目中位直径增大,两种煤灰总脱除效率的差异减小;在相同条件下,东胜煤灰总脱除效率高于大同煤灰总脱除效率.
A two-component sectional algorithm was developed for solving the general dynamic equation of coalfired PM10 aggregation by magnetic seeding, and then it was used to simulate the aggregation dynamics process of fly ash particles from Dongsheng and Datong coal combustion in the size range of 0. 023 -9. 314 μm in a uniform magnetic field by seeding Fe3O4 particles. And the comparison was done between the simulative and experimental data. The results show that the two set of results are essentially consentient. Mid-sized particle removal efficiencies are higher than those of the smaller and bigger ones. When the magnetic flux density, the particle mass concentration and the residence time in the magnetic field are increased, the total removal efficiencies rise and the number median diameters decrease, and the difference in total removal efficiency between the two kinds of fly ash increases at the same time. The increase in magnetic flux density no longer has effect on particle aggregation after particles are saturatedly magnetized. With increase in mass ratio of magnetic seeds/fly ash, the total particle removal efficiencies and number median diameter rise, and the difference in total particle removal efficiency between the two kinds of fly ash decreases. The total particle removal efficiencies for Dongshen coal are higher than those for Datong coal under the same conditions.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2007年第5期517-521,共5页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)基金资助项目(2002CB211600)
江苏省高等学校研究生创新计划基金资助项目
东南大学优秀博士学位论文基金资助项目
关键词
燃煤PM10
聚并
磁种
磁场
coal-fired PM10
aggregation
magnetic seeds
magnetic field
