Numerical Study on Pulverized Biochar Injection in Blast Furnace

• Published in: ISIJ International Vol. 54; no. 7; pp. 1521 - 1529
• Main Authors: Wijayanta, Agung Tri, Alam, Md. Saiful, Nakaso, Koichi, Fukai, Jun, Kunitomo, Kazuya, Shimizu, Masakata
• Format: Journal Article
• Language: English
• Published: Tokyo The Iron and Steel Institute of Japan 01.01.2014; Iron and Steel Institute of Japan
• Subjects: Applied sciences; biochar; blast furnace ironmaking; combustibility; Exact sciences and technology; Metals. Metallurgy; numerical simulation; Combustibility; blast furnace ironmaking; Numerical simulation; Pig iron manufacture; Blast furnace; biochar
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.54.1521

The possibility of injecting pulverized biochar instead of conventional pulverized coal in blast furnace ironmaking was investigated numerically. More detailed reactions including the water-related reactions were considered here. The combustion process from the tuyere to the raceway of a blast furnace was simulated. Oak char (volatile matter wt.% dry basis, VM = 27.11 wt.%-db) provided a lower temperature than Taiheiyo coal (VM = 44.60 wt.%-db). Increasing the O2 concentration from 23 to 27 wt.% resulted in a higher combustibility of both solid fuels. However, the effect of increasing oxygen concentration was still insufficient for the Oak char at high injection rates because of its inadequate volatile content. Biochar properties become increasingly important as the injection rate increases. Compared with Oak char that provided a combustibility of 68% at an injection rate of 200 [(kg solid fuel)/(1000 Nm3 feed gas)] and hot blast of 27 wt.% O2 concentration, Oak char 1 (VM = 32.09 wt.%-db) had a higher combustibility of 71%.