Industrial Furnace , ; 2. :A : 蛳 0001 蛳 08. Simulations of Gas Flow and Heat Transfer in Blast Furnace

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1 ( ) TF531 A 蛳 0001 蛳 08 Simulations of Gas Flow and Heat Transfer in Blast Furnace LI Xiang 1 FENG Yan-hui 1 ZHANG Xin-xin 1 JIANG Ze-yi 1 TIAN Nai-yuan 2 (1.Mechanical Engineering SchoolBeijing University of Science and Technology Beijing China2. Metallurgical and Ecological Engineering School Beijing University of Science and Technology Beijing China) AbstractThe 2-D and 1-D mathematical models for the gas flow and heat transfer in Blast Furnace (BF) were built. The fields of fluid flow pressure and temperature were numerically simulated. The distribution of gas composition along the axial direction is predicted based on the 1-D temperature results. The influences of combustion temperature and rate of air blast are further analyzed. It is shown that the simplified 1-D mathematical model is suitable for predicting the temperature distribution along the axial direction of BF. The position of the cohesive zone pressure drop and top gas temperature are affected by both air blast rate and combustion temperature. Rational air blast rate and combustion temperature are required for the successful operation of BF. Key wordsblast furnace gas flow numerical simulation heat transfer [1] [2] [3] (Koump) [4] [56] [7] Hatano Kurita 1982 [89]. Sugiyama Sugata 1 转载

2 BRIGHT Yagi Austin [1011] CFD/NHT [12] [13] [14-17] (1) (2) (3) - Fluent (4) (5) (6) 塄 ρ g u g =0 (4) 鄣 (ρ g u g ) + 塄 ( ρ gu g u g )=- 塄 (εp g )+ερ g g+ 1 鄣 t ε 塄 (μ 塄 u g )-[ με K u g+ ρ gεf u g u g ] (5) ( V ) 姨 K P g PaF K cm 2 ε [18] 3 L R = E b (1) [19] E b (1-ε)ρ s C s u 鄣 T s s 鄣 y = k 鄣 2 T s sx +k 鄣 2 2 T 鄣 y 2 sy 鄣 y V b πn(d b ) 2 T bp 0 273P b 2 E b = 1 2 ρ V b b (2) h gs a(t g -T s )+Q R (6) gn a m 2 /m 3 k sx k sy W/(m K)h gs L D =R (3) W/(m 2 K) [20] a= R 6(1-ε) 1.2 d p ψ k sx=0.1ρ s C s u s d p k sy =0.5ρ s C s u s d p h gs =γ k g ( Re 1/2 gs d g ) s 2 1

3 d p mψ ερ g C g (u 鄣 T gx 鄣 x +u 鄣 T gy 鄣 x )=k g 鄣鄣 + 鄣 2 T g + 鄣 2 T g 鄣 x 2 鄣 y 2 h e a(t s -T g )+Q R (7) ερ g C g (u 鄣 T gx 鄣 x +u 鄣 T gy 鄣 y )=h ea(t s -T g ) (8) 4 ρ 鄣鄣 = 鄣 K k 鄣 t +u j 鄣 K k 鄣 x j 鄣鄣 x j μ 鄣 eff 鄣 +G k -ρε k (9) σ k + 鄣 K k 鄣 x j 5 ρ 鄣鄣 = 鄣 ε +u 鄣 ε j 鄣 t 鄣 x j 鄣鄣 x j 鄣鄣 + μ eff σ ε 鄣 ε 鄣 x j ε k (C ε1g-c ε2 ρε) (10) G k G k =μ 鄣 u i τ [ 鄣 u i + 鄣 x j 鄣 x j 鄣 u j 鄣 x i ]μ eff μ eff =μ l+ μ t Pa sμ t μ t =ρc k 2 μ sc ε1 C ε2 C μ σ k σ ε - [21] C ε1 =1.43C ε2 =1.93C μ =0.09σ k =1.0 σ ε =1.3 q=h w (T w -T g ) 6 q=0 ΔP (1-ε)2 =150 μ H ε 3 ( 准 d p ) u A ε ρ u 2 2 ε 3 A 准 d (11) 2 p T g0 =const T g0 =(Q C +Q +Q -Q -Q )/(V C ) (12) T g ~2 150 J/(m 3 3 s) [22-24] 1 (473 K K) Fe x O y (s)+co=fe x O y-1 (s)+co 2 (g) Fe 2 O 3 Fe 3 O 4 CO FeO K~ K FeO FeO(s)+CO=Fe(s)+CO 2 (g) ΔH= kj/mol 2 (1 273 K K) FeO(s)+C(s)=Fe(s)+CO(g) ΔH=152.2 kj/mol 3 (1 573 K K) FeO(s)+C(s)=Fe(s)+CO(g) ΔH=152.2 kj/mol Fe(s)+Fe(l)ΔH Fe =15.2 kj/mol gangue(s)=slag(l)δh slag =15.1 kj/mol 4 ε Pa sμ l Pa ( u 1 =u 2 =0) T s0 =const 4 鄣 u 鄣 x =0 鄣 T s 鄣 x = 鄣 T g 鄣 x =0 5 3

4 鄣 u 鄣 x =0 T s=t g =1 773 K 1-ε 鄣 鄣 x (ρ su s C s T s )= 鄣鄣 x k s Gambit CFD Fluent6.2 k-ε 鄣鄣 +h gs a(t g -T s )+Q R (14) 10-3 x=l T s =T sin 鄣 T g 鄣 x =0u s= m s ρ s A ( 2) Java 3 鄣 T s 鄣 x x=0 T g =T gin 鄣 T s 鄣 x =0u g= m g ρ g A (1) (2) m (3) K 200 m/s (4) 3.1 4(a) 5 (b) (5) 2.2 ε 鄣鄣 x (ρ gu g C g T g )= 鄣鄣 x 4 k 鄣 T 鄣 s g 鄣 x 鄣 +h gs a(t s -T g )+Q R (13)

5 D1/m 8.4 D2/m 13 D3/m 11 H5/m 1.7 H3/m 2 H4/m 17.7 H2/m 3 H1/m 2 ρ s /kg m ε d p/m 准 ρ s/kg m μ /Pa s -1 C f /J (kg K) -1 C s / J (kg K) (100 ) 1 465(1 000 ) 670(100 ) 840(500 ) k f /W (m K) /m /m 2.0 m 1.8 m 1.6 m 1.4 m 1.2 m 1.0 m 0.8 m 0.6 m 0.4 m 0.2 m 0 m 2.5 m 3.5 m 4.5 m 5.5 m /m 8.0 m 7.8 m 7.6 m 7.4 m 7.2 m 7.0 m 6.8 m 6.6 m 6.4 m 6.2 m 6.0 m 1.3 m 2.3 m 3.3 m 4.3 m /m (a) /m s -1 (b) /Pa (c) /K (d) 4 4(b) ) mm mm mm 5(a) 4(d) 1 300~ mm( 2.40e e e e e e+03 4(c) e+03 K~2 400 K K 1.20e e e K( 443 ) 6.00e e +03 te e +04 2e e +04 3e +04 /mm 6 (T g K) (T g K ) /K 5 r=0 r=1 300 r=2 600 r=

6 ( K) 2.5 m ) 3.2 [25] ( 4) ( 7) 8 4 / CO V CO CO 35%~45% CO 2 8 CO CO CO 2 CO 20%~ 25% CO 2 15%~22% CO+ CO 2 35%~45% CO 2 + CO CO 2 ( CO ) CO CO (672 K) (716 (1) /K /mm 10 4 /% K K (2) 7

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