Comprehensive Research about Critical Interaction Region Named Cohesive Zone in Series of Dissected Blast Furnaces

Abstract

Ironmaking industry occupies significant responsibility of resource-saving and environment-protecting in the national economy. As the largest monomer smelting unit in ironmaking process, the efficiency of blast furnace can directly determine the consumption of energy. Researchers have conducted vast investigations about cohesive zone due to its energy redistribution and interaction-concentrated region role in blast furnace. Amidst this backdrop, the behavior of cohesive zone obtained through the most direct mothed, the dissection investigation, is introduced in this article, including blast furnaces from Japan, European countries and China. Moreover, a brief introduction about the way to cool down working blast furnace is also covered. The relationship between operation and macro-profile of cohesive zone, the behavior of various burden in cohesive zone and the effect of harmful elements on the softening & melting properties were mostly conducted in Japanese dissected blast furnace. The charge properties in cohesive zone were investigated through German Mannesmann No. 5 dissected blast furnace and Swedish 8.2 m 3 dissected experimental blast furnace. China had conducted three dissection research including 23 m 3 Shougang blast furnace, 0.8 m 3 Pangang blast furnace and 125 m 3 Laigang blast furnace, while a damage investigation in 1 050 m 3 blast furnace was also selected. The existing studies witness the recognition process of cohesive zone in several European countries, as well as Japan and China, reflecting the development of ironmaking technology.

Effect of Sinter Reducibility on Softening-Melting-Dripping Behaviors of Burden: Sinter and Coke Layered Charging

“…The gas flow distribution and burden permeability are determined by the cohesive zone. The research shows that the cohesive zone is the area with the largest pressure loss in the BF, 11,12) and more than 60% of the total pressure loss comes from cohesive zone. Therefore, the shape and position of the cohesive zone are critical factors to ensure the reasonable gas flow distribution, improve the permeability and achieve low-carbon operation.…”