Improvement of the Uniformity of Blast Distribution over the Circumference of Blast-Furnace Hearth

Evaluation and Improvement of Circumferential Uniformity for Blast Furnace Raceway

“…Jue TANG,* 1,2) Zedong ZHANG, 1) Quan SHI, 1) Mansheng CHU, 3,4) Anchuan LIN 5) and Yingjie LUO 5) 1) School of Metallurgy, Northeastern University, [3][4][5][6][7][8][9][10][11] The bustle pipe model of a running 2 500 m 3 blast furnace was established. The local and overall uniformity indexes of the raceway were defined and constructed.…”

“…In this work, the relevant calculation formulas of raceway shape and properties were given as Eqs. ( 1)- (6). Where, x O2 is the oxygen enrichment, %; f is the blast humidity, g/m 3 ; O 2 is the oxygen flow rate, m 3 /h; n is the number of tuyere, -; V b is the dry blast flow rate, m 3 /min; t b is the blast temperature, K; E is the blast kinetic energy, kJ/s; D R is the depth of raceway, m; W R is the width of raceway, m; H R is the height of raceway, m; V R is the volume of raceway, m 3 ; p f is the penetration factor, -; D T is the diameter of tuyere, m; ρ 0 -is the density of bosh gas, kg/m 3 ; ρ s is the real density of coke, kg/m 3 ; V g is the volume flow rate of nest, m 3 / min; T r is the adiabatic combustion temperature, K; P b is the pressure of blast, kPa; D C is the diameter of coke in tuyere, m; S T is the area of tuyere, m 2 .…”

“…[1][2][3][4][5] The circumferential unevenness of raceway would lead to the inconsistency of circumferential hearth activity, resulting in the deterioration of burden descent, the bad smelting environment, the decrease of pig iron quality, and the damage of BF service life. [6][7][8][9][10] Therefore, the research on the circumferential uniformity of raceway had attracted much attention in recent years. [11][12][13][14][15][16][17][18] Bugaev et al found that the blast temperature difference among all the tuyeres was 150-250°C and the maximum adiabatic combustion temperature difference of raceway was corresponding to 508°C (1 772-2 280°C), when the…”

Power Supply at Metallurgical Iron-and-Steel Works: Features and Development Prospects

“…For powerful BFs, the blast flow rate is approximately 2.2-2.5 m 3 /min per unit of working furnace volume. This means that, for a blast furnace with a volume of 2300-3000 m 3 , a blower is required having a capacity of 5000-7000 m 3 /min, a power rating of 20-30 MW, as well as a speed control mechanism [11,12]. Taking into account these requirements, a condensing steam turbine with a steam pressure of 3.5 (9) MPa and a temperature of 435 (535 °C has already served as the main drive for the blowers for decades [13].…”

Numerical simulation of air flow and distribution in the blast system of blast furnace

“…As one of the four major operating systems of the blast furnace, the blast system mainly affects the depth and height of the raceway in the furnace, and directly determines the initial distribution of gas flow in the furnace. Moreover, with the development of large-scale blast furnaces, the circumferential uniform distribution of gas flow is also crucial [1][2][3][4]. Therefore, it is necessary to study the uniformity of air flow distribution at each tuyere of the blast system of the blast furnace.…”