摘要
研究了球形难熔固体粒子在液相中运动 ,因阻力系数不同分成 3个区域的 2个临界直径 :d12 =0 .917υ2 ·ρlΔρ13 ;d2 3 =32 .3υ2 ·ρlΔρ13 。推导了熔体绕流球形固体粒子的传质系数 :在第一区(Stokes区 ) ,kM1=0 .878Δρ·D2ρl·υ13 ;在第二区 (过渡区 ) ,kM2 =2 .2 2 Δρ·D4ρl1d12;在第三区 (New ton区 ) ,kM 3 =3.34Δρρl18υ112 ·D23d58。相应 3个区难熔球形固体粒子溶解时间是 :τ1=0 .5 7(Cs-C)·ρs(C -C)D23· υρ2 l·Δρ13 ·d ;τ2 =0 .2 3(Cs-C)·ρs(C -C)D231ρ5l·Δρ16·d32 ;τ3 =0 .15 (Cs-C)·ρs(C -C)D23·1ρ7l·Δρ·υ2318·d138。讨论了石灰与增碳剂溶解时间简便计算式 ,非球形难熔固体粒子溶解时间计算式和增碳剂最大粒度问题。
The movement of high melting spheridal solid particles in liquid phase is studied.The whole liquid phase can be divided into three zones according to their different drag coefficients.Two critical radius of the three zones are d 12=0.917υ2·ρ lΔρ 13;d 23= 32.3υ2·ρ lΔ 13 .The mass transfer coefficients for the high melting circulating flow spheridal solid particles are derived as follows τ 1=0.57(C s-C)·ρ s(C*-C)D 23·υρ2 l·Δρ 13·d;τ 2=0.23(C s-C)·ρ s(C-C)D 231ρ5 l·Δρ 16·d 32;τ 3=0.15(C s-C)·ρ s(C-C)D 32·1ρ7 l·Δρ·υ 23 18·d 138 . k M1=0.878Δρ·D2ρ l·υ 13 in the first zone (stokes zone); k M2=2.22Δρ·D4ρ l1d 12 in the second zone (transition zone) and k M3=3.34Δρρ l 18υ 112·D 23d 58 in the third zone (Newton zone).Problems about calculating formulas for dissolution time of carburizer and of high melting disspheridal solid particles and the maximum grain size of the carburizer are dealt with as well.
出处
《炼钢》
CAS
北大核心
2003年第6期33-37,共5页
Steelmaking
