煤烧圆家重点实验宝 Chapter 4 Gas-Solid Two-Phase Flow Examples: pulverized coal dust as National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn Chapter 4 Gas - Solid Two-Phase Flow Examples: pulverized coal soot dust ash
煤烧圆家重点实验宝 8 1 Characteristics of GaS-solid Two Phase Flow RoSin-Pammler formula K4)=c×1 (4-1) R(dk)-weight percent of particle with d > dk n-index of non-evenness d- characteristic diameter dR exp 4-2) National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn §1 Characteristics of Gas-solid Two Phase Flow Rosin-Pammler Formula ( ) ( ) n R dk = exp − dk / d (4-1) R(dk ) - weight percent of particle with d > dk n - index of non-evenness d - characteristic diameter ( ) ( ) ( ) n k n n k k d d d d n d d dR exp / ( ) ( 1) = − − (4-2)
煤烧圆家重点实验宝 Particle average dimension radii average dlo=∑nkdkΣn 4-3) area average d20=(∑nkdk2△>nk)12(4-4) volume average d30=(2nkd /2nk)3(4-5) Sauter average d32=Enk dk/(2nydk2)(4-6 Typical particle size coal in fluidized beds 0-10 mm pulverized coal 1-100um National Lab, of Coal Combustion. HUST 1-10um Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn Particle average dimension: radii average d10 = Snkdk /Snk (4-3) area average d20 = (Snkdk 2 /Snk ) 1/2 (4-4) volume average d30 = (Snkdk 3 /Snk ) 1/3 (4-5) Sauter average d32 = Snkdk 3 /(Snkdk 2 ) (4-6) Typical particle size: coal in fluidized beds 0 - 10 mm pulverized coal 1 - 100mm soot 1 - 10 mm
煤量甏圆家重点实验宝 2. Density Pm -combined density, Pm= Mm/Vm=(M+ Me)/V pr- superficial density of fluid, Pf=M/v Po, Pk -superficial density of particle, P,=M/V Pp-real density of particle relation +n=P+∑=p1+②∑nml/6 National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn 2. Density rm - combined density, rm = Mm/Vm = (Mp + Mf )/Vm rf - superficial density of fluid, rf = Mf /Vm rp , rk - superficial density of particle, rp = Mp / Vm rp - real density of particle relation: = + = + = + ( ) m f p f k f k k p r r r r r r n d / 6 r 3 (4-7)
煤量甏圆家重点实验宝 3. Concentration Volume concentration P (4-8) Mass concentration M+M P M 4-9) National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn 3. Concentration Volume concentration f p v f p p v V V C V V V C = + = (4-8) Mass concentration f p w f p p w M M C M M M C = + = (4-9)