细粒煤磁场流化床脱硫降灰的研究

Coal is the main energy of China.Only about 25% of raw coal is separated in China. The soot pollution is very serious as burning raw coal directly.Hence,it is very important to utilize clean coal.However,2/3 of coal is in arid areas in West region of China, the fine coal(accounting for more than 50% of raw coal) dry cleaning is necessary.Introducing a magnetic field into a conventional fluidized bed,a new fluidized bed with better fluidizing and separation performances,was formed.On the basis of theoretical and experimental studying by NAC Memrecom Ci-3 high speed dynamic analyzing system and numerical simulation,the forming and separating mechanism as well as dynamic models were proposed. A high performance magnetically stabilized fluidized bed(MSFB),using 43-74μm magnetic pearls as medium solids,was formed.The state and double-hydrokinetics models of MSFB were established.The relating formula of lower limit of separation was obtained as K[(1-ε0)/(1+m)]-1/3 ds <dfm≤[18Re0μb2/ρb∣ρf-ρb ∣g]1/3 , The lower limit of separation can reach 0.5mm with 0.05-0.08 Ep values.A new dry approach for removal of sulfur and ash from fine coal with MSFB is put forward.The separation theory for fine coal with MSFB is established.

将磁场引入气固流化应酬，提示磁场流化床形成密度均匀稳定的无泡散式床的机理，实现细粒煤的高效脱硫降灰，为占我国2/3分布在缺水地区的煤炭（细粒煤占60%以上）提供了一条新的高效干法洁净途径。研究内容：磁场对气固流化床密度均匀稳定性的作用机制；加重质物性（磁性物含量、粒度）与磁场参数之间的匹配；细粒煤在磁场流化床中的分离规律。